diff --git a/.rustfmt.toml b/.rustfmt.toml
index 4df947e3..1599c01a 100644
--- a/.rustfmt.toml
+++ b/.rustfmt.toml
@@ -1,4 +1,4 @@
 # https://github.com/rust-lang/rustfmt/blob/master/Configurations.md#merge_imports
 merge_imports = true
 # https://github.com/rust-lang/rustfmt/blob/master/Configurations.md#max_width
-max_width = 120
\ No newline at end of file
+max_width = 100
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
index aae6204d..3d2f4433 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,67 +1,127 @@
+[[package]]
+name = "aho-corasick"
+version = "0.6.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "ansi_term"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "arrayvec"
-version = "0.4.7"
+version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "autocfg"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "backtrace"
-version = "0.3.9"
+version = "0.3.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace-sys 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "backtrace-sys"
-version = "0.1.24"
+version = "0.1.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "base64"
-version = "0.10.0"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "bit-set"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bit-vec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "bit-vec"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "bitflags"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "block-buffer"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-padding 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byte-tools 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "block-padding"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byte-tools 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "byte-tools"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "byteorder"
-version = "1.2.6"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bytes"
-version = "0.4.10"
+version = "0.4.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "cc"
-version = "1.0.25"
+version = "1.0.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cfg-if"
-version = "0.1.5"
+version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -71,7 +131,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -84,61 +144,104 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-deque"
-version = "0.6.1"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-epoch 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-epoch 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.5.2"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "crossbeam-queue"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "crossbeam-utils"
-version = "0.5.0"
+version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "digest"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "dtoa"
 version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "either"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "envy"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "failure"
-version = "0.1.3"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "failure_derive"
-version = "0.1.3"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "synstructure 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "fake-simd"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "fnv"
 version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "fuchsia-cprng"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "fuchsia-zircon"
 version = "0.3.3"
@@ -164,32 +267,75 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "generic-array"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "h2"
-version = "0.1.13"
+version = "0.1.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "indexmap 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "string 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "indexmap 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "string 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "headers"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "headers-core 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "headers-derive 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mime 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha-1 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "headers-core"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "headers-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.29 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "http"
-version = "0.1.13"
+version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -201,26 +347,28 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "hyper"
-version = "0.12.12"
+version = "0.12.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "h2 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "h2 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "httparse 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-reactor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-tcp 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-timer 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-executor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-tcp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-threadpool 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-timer 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "want 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -231,12 +379,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-normalization 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-normalization 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "indexmap"
-version = "1.0.1"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -244,7 +392,7 @@ name = "iovec"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -266,83 +414,80 @@ dependencies = [
 name = "lambda_http"
 version = "0.1.0"
 dependencies = [
- "base64 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "lambda_runtime 0.1.0",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.31 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_urlencoded 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "simple_logger 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "lambda_runtime"
 version = "0.1.0"
 dependencies = [
- "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.12.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.12.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "lambda_runtime_client 0.1.0",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.31 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "simple_logger 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "lambda_runtime_client"
 version = "0.1.0"
 dependencies = [
- "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.12.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.31 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.12.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "lazy_static"
-version = "1.1.0"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "lazycell"
-version = "1.2.0"
+version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.43"
+version = "0.2.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "lock_api"
-version = "0.1.4"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "owning_ref 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "log"
-version = "0.4.5"
+version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -350,11 +495,24 @@ name = "matches"
 version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "memchr"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "memoffset"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "mime"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicase 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "mio"
 version = "0.6.16"
@@ -364,12 +522,12 @@ dependencies = [
  "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazycell 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
- "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -379,7 +537,7 @@ version = "0.6.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -399,14 +557,14 @@ name = "net2"
 version = "0.2.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "nodrop"
-version = "0.1.12"
+version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -424,15 +582,20 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "num_cpus"
-version = "1.8.0"
+version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "opaque-debug"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "owning_ref"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -440,22 +603,22 @@ dependencies = [
 
 [[package]]
 name = "parking_lot"
-version = "0.6.4"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lock_api 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "parking_lot_core"
-version = "0.3.1"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -466,45 +629,184 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "proc-macro2"
-version = "0.4.19"
+version = "0.4.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "proptest"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bit-set 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rusty-fork 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 3.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "quick-error"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "quote"
-version = "0.6.8"
+version = "0.6.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand"
-version = "0.5.5"
+version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_core 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_isaac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_jitter 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_os 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_pcg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand_chacha"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand_core"
-version = "0.2.1"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "rand_hc"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_isaac"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_jitter"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_os"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_pcg"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_xorshift"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rdrand"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "redox_syscall"
-version = "0.1.40"
+version = "0.1.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "regex"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "aho-corasick 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "remove_dir_all"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rustc-demangle"
-version = "0.1.9"
+version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -515,9 +817,20 @@ dependencies = [
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rusty-fork"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 3.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wait-timeout 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "ryu"
-version = "0.2.6"
+version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -540,27 +853,30 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.79"
+version = "1.0.89"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "serde_derive 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.79"
+version = "1.0.89"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.29 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.31"
+version = "1.0.39"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "ryu 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -570,8 +886,51 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "dtoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "sha-1"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "opaque-debug 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "simple-lambda-runtime"
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+ "tokio-trace 0.0.1 (git+https://github.com/tokio-rs/tokio)",
+ "tokio-trace-fmt 0.1.0 (git+https://github.com/tokio-rs/tokio-trace-nursery)",
+ "tower 0.1.0 (git+https://github.com/tower-rs/tower)",
+ "tower-add-origin 0.1.0 (git+https://github.com/tower-rs/tower-http)",
+ "tower-buffer 0.1.0 (git+https://github.com/tower-rs/tower)",
+ "tower-http-service 0.1.0 (git+https://github.com/tower-rs/tower-http)",
+ "tower-hyper 0.1.0 (git+https://github.com/tower-rs/tower-hyper)",
+ "tower-in-flight-limit 0.1.0 (git+https://github.com/tower-rs/tower)",
+ "tower-mock 0.1.0 (git+https://github.com/tower-rs/tower)",
+ "tower-retry 0.1.0 (git+https://github.com/tower-rs/tower)",
+ "tower-timeout 0.1.0 (git+https://github.com/tower-rs/tower)",
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@@ -580,21 +939,18 @@ version = "1.0.1"
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  "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
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-version = "0.4.1"
+version = "0.4.2"
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 [[package]]
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-dependencies = [
- "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -603,59 +959,93 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
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+ "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "tokio-executor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
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diff --git a/Cargo.toml b/Cargo.toml
index 2aae614b..bbb1325b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,5 +2,9 @@
 members = [
     "lambda-runtime-client",
     "lambda-runtime",
-    "lambda-http"
-]
\ No newline at end of file
+    "lambda-http",
+    "lambda-runtime-client-simple"
+]
+
+[patch.crates-io]
+tower-service = { git = "https://github.com/tower-rs/tower" }
diff --git a/lambda-http/Cargo.toml b/lambda-http/Cargo.toml
index 22861f75..66273a08 100644
--- a/lambda-http/Cargo.toml
+++ b/lambda-http/Cargo.toml
@@ -18,8 +18,8 @@ maintenance = { status = "actively-developed" }
 [dependencies]
 http = "0.1"
 serde = "^1"
-serde_json = "^1"
 serde_derive = "^1"
+serde_json = "^1"
 lambda_runtime = { path = "../lambda-runtime", version = "^0.1" }
 tokio = "^0.1"
 base64 = "0.10"
diff --git a/lambda-http/src/body.rs b/lambda-http/src/body.rs
index baf954e0..02df9c5c 100644
--- a/lambda-http/src/body.rs
+++ b/lambda-http/src/body.rs
@@ -150,10 +150,11 @@ impl<'a> Serialize for Body {
         S: Serializer,
     {
         match self {
-            Body::Text(data) => {
-                serializer.serialize_str(::std::str::from_utf8(data.as_ref()).map_err(S::Error::custom)?)
+            Body::Text(data) => serializer
+                .serialize_str(::std::str::from_utf8(data.as_ref()).map_err(S::Error::custom)?),
+            Body::Binary(data) => {
+                serializer.collect_str(&Base64Display::with_config(data, base64::STANDARD))
             }
-            Body::Binary(data) => serializer.collect_str(&Base64Display::with_config(data, base64::STANDARD)),
             Body::Empty => serializer.serialize_unit(),
         }
     }
diff --git a/lambda-http/src/ext.rs b/lambda-http/src/ext.rs
index 6b4c76ab..60d1caf1 100644
--- a/lambda-http/src/ext.rs
+++ b/lambda-http/src/ext.rs
@@ -134,7 +134,10 @@ impl RequestExt for HttpRequest<super::Body> {
     }
 
     fn request_context(&self) -> RequestContext {
-        self.extensions().get::<RequestContext>().cloned().unwrap_or_default()
+        self.extensions()
+            .get::<RequestContext>()
+            .cloned()
+            .unwrap_or_default()
     }
 
     fn payload<D>(&self) -> Result<Option<D>, PayloadError>
@@ -144,9 +147,11 @@ impl RequestExt for HttpRequest<super::Body> {
         self.headers()
             .get(CONTENT_TYPE)
             .map(|ct| match ct.to_str() {
-                Ok("application/x-www-form-urlencoded") => serde_urlencoded::from_bytes::<D>(self.body().as_ref())
-                    .map_err(PayloadError::WwwFormUrlEncoded)
-                    .map(Some),
+                Ok("application/x-www-form-urlencoded") => {
+                    serde_urlencoded::from_bytes::<D>(self.body().as_ref())
+                        .map_err(PayloadError::WwwFormUrlEncoded)
+                        .map(Some)
+                }
                 Ok("application/json") => serde_json::from_slice::<D>(self.body().as_ref())
                     .map_err(PayloadError::Json)
                     .map(Some),
@@ -177,14 +182,20 @@ mod tests {
             ..GatewayRequest::default()
         };
         let actual = HttpRequest::from(gwr);
-        assert_eq!(actual.query_string_parameters(), StrMap(query.clone().into()));
+        assert_eq!(
+            actual.query_string_parameters(),
+            StrMap(query.clone().into())
+        );
     }
 
     #[test]
     fn requests_have_form_post_parseable_payloads() {
         let mut headers = HeaderMap::new();
         headers.insert("Host", "www.rust-lang.org".parse().unwrap());
-        headers.insert("Content-Type", "application/x-www-form-urlencoded".parse().unwrap());
+        headers.insert(
+            "Content-Type",
+            "application/x-www-form-urlencoded".parse().unwrap(),
+        );
         #[derive(Deserialize, PartialEq, Debug)]
         struct Payload {
             foo: String,
@@ -211,7 +222,10 @@ mod tests {
     fn requests_have_form_post_parseable_payloads_for_hashmaps() {
         let mut headers = HeaderMap::new();
         headers.insert("Host", "www.rust-lang.org".parse().unwrap());
-        headers.insert("Content-Type", "application/x-www-form-urlencoded".parse().unwrap());
+        headers.insert(
+            "Content-Type",
+            "application/x-www-form-urlencoded".parse().unwrap(),
+        );
         let gwr: GatewayRequest<'_> = GatewayRequest {
             path: "/foo".into(),
             headers,
diff --git a/lambda-http/src/lib.rs b/lambda-http/src/lib.rs
index 8014a0fd..e2dfae61 100644
--- a/lambda-http/src/lib.rs
+++ b/lambda-http/src/lib.rs
@@ -45,6 +45,9 @@
 //! }
 //! ```
 
+#[macro_use]
+extern crate serde_derive;
+
 pub use http::{self, Response};
 use lambda_runtime::{self as lambda, error::HandlerError, Context};
 use tokio::runtime::Runtime as TokioRuntime;
diff --git a/lambda-http/src/request.rs b/lambda-http/src/request.rs
index 2fcca05e..3b022bb7 100644
--- a/lambda-http/src/request.rs
+++ b/lambda-http/src/request.rs
@@ -12,7 +12,6 @@ use serde::{
     de::{Error as DeError, MapAccess, Visitor},
     Deserialize, Deserializer,
 };
-use serde_derive::Deserialize;
 use serde_json::Value;
 
 use crate::{
@@ -108,7 +107,9 @@ where
 }
 
 /// Deserialize a map of Cow<'_, str> => Vec<Cow<'_, str>> into an http::HeaderMap
-fn deserialize_multi_value_headers<'de, D>(deserializer: D) -> Result<HeaderMap<HeaderValue>, D::Error>
+fn deserialize_multi_value_headers<'de, D>(
+    deserializer: D,
+) -> Result<HeaderMap<HeaderValue>, D::Error>
 where
     D: Deserializer<'de>,
 {
@@ -136,8 +137,8 @@ where
                 if !key.is_empty() {
                     for value in values {
                         let header_name = key.parse::<HeaderName>().map_err(A::Error::custom)?;
-                        let header_value =
-                            HeaderValue::from_shared(value.into_owned().into()).map_err(A::Error::custom)?;
+                        let header_value = HeaderValue::from_shared(value.into_owned().into())
+                            .map_err(A::Error::custom)?;
                         headers.append(header_name, header_value);
                     }
                 }
@@ -173,7 +174,8 @@ where
                 .unwrap_or_else(HeaderMap::new);
             while let Some((key, value)) = map.next_entry::<Cow<'_, str>, Cow<'_, str>>()? {
                 let header_name = key.parse::<HeaderName>().map_err(A::Error::custom)?;
-                let header_value = HeaderValue::from_shared(value.into_owned().into()).map_err(A::Error::custom)?;
+                let header_value = HeaderValue::from_shared(value.into_owned().into())
+                    .map_err(A::Error::custom)?;
                 headers.append(header_name, header_value);
             }
             Ok(headers)
@@ -286,7 +288,9 @@ mod tests {
             headers,
             ..GatewayRequest::default()
         };
-        let expected = HttpRequest::get("https://www.rust-lang.org/foo").body(()).unwrap();
+        let expected = HttpRequest::get("https://www.rust-lang.org/foo")
+            .body(())
+            .unwrap();
         let actual = HttpRequest::from(gwr);
         assert_eq!(expected.method(), actual.method());
         assert_eq!(expected.uri(), actual.uri());
@@ -299,7 +303,10 @@ mod tests {
         // https://docs.aws.amazon.com/lambda/latest/dg/eventsources.html#eventsources-api-gateway-request
         let input = include_str!("../tests/data/apigw_proxy_request.json");
         let result = serde_json::from_str::<GatewayRequest<'_>>(&input);
-        assert!(result.is_ok(), format!("event was not parsed as expected {:?}", result));
+        assert!(
+            result.is_ok(),
+            format!("event was not parsed as expected {:?}", result)
+        );
     }
 
     #[test]
@@ -346,7 +353,9 @@ mod tests {
 
         assert_eq!(
             serde_json::from_str::<Test>(r#"{"foo":null}"#).expect("failed to deserialize"),
-            Test { foo: HashMap::new() }
+            Test {
+                foo: HashMap::new()
+            }
         )
     }
 
diff --git a/lambda-http/src/response.rs b/lambda-http/src/response.rs
index 5258aa7c..bf08db26 100644
--- a/lambda-http/src/response.rs
+++ b/lambda-http/src/response.rs
@@ -9,9 +9,8 @@ use http::{
 };
 use serde::{
     ser::{Error as SerError, SerializeMap},
-    Serializer,
+    Deserialize, Serialize, Serializer,
 };
-use serde_derive::Serialize;
 
 use crate::body::Body;
 
@@ -20,7 +19,10 @@ use crate::body::Body;
 #[serde(rename_all = "camelCase")]
 pub(crate) struct GatewayResponse {
     pub status_code: u16,
-    #[serde(skip_serializing_if = "HeaderMap::is_empty", serialize_with = "serialize_headers")]
+    #[serde(
+        skip_serializing_if = "HeaderMap::is_empty",
+        serialize_with = "serialize_headers"
+    )]
     pub headers: HeaderMap<HeaderValue>,
     #[serde(
         skip_serializing_if = "HeaderMap::is_empty",
@@ -47,7 +49,10 @@ impl Default for GatewayResponse {
 }
 
 /// Serialize a http::HeaderMap into a serde str => str map
-fn serialize_multi_value_headers<S>(headers: &HeaderMap<HeaderValue>, serializer: S) -> Result<S::Ok, S::Error>
+fn serialize_multi_value_headers<S>(
+    headers: &HeaderMap<HeaderValue>,
+    serializer: S,
+) -> Result<S::Ok, S::Error>
 where
     S: Serializer,
 {
@@ -188,7 +193,8 @@ mod tests {
     #[test]
     fn serialize_default() {
         assert_eq!(
-            serde_json::to_string(&GatewayResponse::default()).expect("failed to serialize response"),
+            serde_json::to_string(&GatewayResponse::default())
+                .expect("failed to serialize response"),
             r#"{"statusCode":200}"#
         );
     }
diff --git a/lambda-http/src/strmap.rs b/lambda-http/src/strmap.rs
index 10801733..fb5dbddc 100644
--- a/lambda-http/src/strmap.rs
+++ b/lambda-http/src/strmap.rs
@@ -27,9 +27,12 @@ impl StrMap {
 
     /// Return all values associated with name where available
     pub fn get_all(&self, key: &str) -> Option<Vec<&str>> {
-        self.0
-            .get(key)
-            .map(|values| values.iter().map(|owned| owned.as_str()).collect::<Vec<_>>())
+        self.0.get(key).map(|values| {
+            values
+                .iter()
+                .map(|owned| owned.as_str())
+                .collect::<Vec<_>>()
+        })
     }
 
     /// Return true if the underlying map is empty
@@ -70,13 +73,15 @@ impl<'a> Iterator for StrMapIter<'a> {
 
     #[inline]
     fn next(&mut self) -> Option<(&'a str, &'a str)> {
-        self.keys.next().and_then(|k| self.data.get(k).map(|v| (k.as_str(), v)))
+        self.keys
+            .next()
+            .and_then(|k| self.data.get(k).map(|v| (k.as_str(), v)))
     }
 }
 
 /// internal type used when deserializing StrMaps from
 /// potentially one or many valued maps
-#[derive(serde_derive::Deserialize)]
+#[derive(Deserialize)]
 #[serde(untagged)]
 enum OneOrMany {
     One(String),
@@ -101,7 +106,10 @@ impl<'de> Deserialize<'de> for StrMap {
             where
                 A: MapAccess<'de>,
             {
-                let mut inner = map.size_hint().map(HashMap::with_capacity).unwrap_or_else(HashMap::new);
+                let mut inner = map
+                    .size_hint()
+                    .map(HashMap::with_capacity)
+                    .unwrap_or_else(HashMap::new);
                 // values may either be String or Vec<String>
                 // to handle both single and multi value data
                 while let Some((key, value)) = map.next_entry::<_, OneOrMany>()? {
diff --git a/lambda-runtime-client-simple/Cargo.toml b/lambda-runtime-client-simple/Cargo.toml
new file mode 100644
index 00000000..6b478423
--- /dev/null
+++ b/lambda-runtime-client-simple/Cargo.toml
@@ -0,0 +1,35 @@
+[package]
+name = "simple-lambda-runtime"
+version = "0.1.0"
+authors = ["David Barsky <dbarsky@amazon.com>"]
+edition = "2018"
+
+[dependencies]
+bytes = "^0.4"
+failure = "^0.1"
+futures = "^0.1"
+hyper = "^0.12"
+http = "^0.1"
+headers = "0.2"
+envy = "0.3"
+tokio = "^0.1"
+lazy_static = "1.3"
+tokio-threadpool = "^0.1"
+tokio-trace = { git = "https://github.com/tokio-rs/tokio" }
+tokio-trace-fmt = { git = "https://github.com/tokio-rs/tokio-trace-nursery" }
+tower = { git = "https://github.com/tower-rs/tower" }
+tower-add-origin = { git = "https://github.com/tower-rs/tower-http" }
+tower-http-service = { git = "https://github.com/tower-rs/tower-http" }
+tower-hyper = { git = "https://github.com/tower-rs/tower-hyper" }
+tower-mock = { git = "https://github.com/tower-rs/tower" }
+tower-retry = { git = "https://github.com/tower-rs/tower" }
+tower-timeout = { git = "https://github.com/tower-rs/tower" }
+tower-buffer = { git = "https://github.com/tower-rs/tower" }
+tower-in-flight-limit =  { git = "https://github.com/tower-rs/tower" }
+serde = { version = "^1", features = ["derive"] }
+serde_derive = "^1"
+serde_json = "^1"
+
+[dev-dependencies]
+tokio-io = "0.1.12"
+proptest = "0.9"
\ No newline at end of file
diff --git a/lambda-runtime-client-simple/examples/bootstrap.rs b/lambda-runtime-client-simple/examples/bootstrap.rs
new file mode 100644
index 00000000..f19aa7ac
--- /dev/null
+++ b/lambda-runtime-client-simple/examples/bootstrap.rs
@@ -0,0 +1,16 @@
+#[macro_use]
+extern crate tokio_trace;
+
+use bytes::Bytes;
+use futures::{future::ok, Future};
+use hyper::Body;
+use simple_lambda_runtime::{lambda, Error};
+
+fn main() -> Result<(), Error> {
+    lambda!(handler)
+}
+
+fn handler(event: Body) -> Box<dyn Future<Item = Bytes, Error = Error> + Send> {
+    info!("Received event");
+    Box::new(ok(Bytes::from("hello")))
+}
diff --git a/lambda-runtime-client-simple/src/client.rs b/lambda-runtime-client-simple/src/client.rs
new file mode 100644
index 00000000..64498b5b
--- /dev/null
+++ b/lambda-runtime-client-simple/src/client.rs
@@ -0,0 +1,67 @@
+use bytes::Bytes;
+use futures::{Async, Future};
+use hyper::{Request, Uri};
+use std::{marker::PhantomData, time::Duration};
+use tower::{builder::ServiceBuilder, util::ServiceExt, Service};
+use tower_add_origin::{AddOrigin, Builder as AddOriginBuilder};
+use tower_buffer::{Buffer, BufferLayer};
+use tower_hyper::retry::RetryPolicy;
+use tower_in_flight_limit::{InFlightLimit, InFlightLimitLayer};
+use tower_retry::RetryLayer;
+use tower_timeout::{Timeout, TimeoutLayer};
+
+type Err = Box<dyn std::error::Error + Send + Sync>;
+
+pub(crate) struct LambdaSvc<S, B>
+where
+    S: Service<Request<B>> + Send + 'static,
+    S::Error: std::error::Error + Send + Sync + 'static,
+    S::Future: Send,
+    B: Send + 'static,
+{
+    inner: Buffer<InFlightLimit<Timeout<AddOrigin<S>>>, Request<B>>,
+    _phan: PhantomData<S>,
+}
+
+impl<S, B> LambdaSvc<S, B>
+where
+    S: Service<Request<B>> + Send + 'static,
+    S::Error: std::error::Error + Send + Sync + 'static,
+    S::Future: Send,
+    B: Send + 'static,
+{
+    fn new(svc: S, origin: Uri) -> Self {
+        let svc: AddOrigin<S> = AddOriginBuilder::new().uri(origin).build(svc).unwrap();
+        let svc = ServiceBuilder::new()
+            .layer(InFlightLimitLayer::new(1))
+            .layer(TimeoutLayer::new(Duration::from_millis(300)))
+            .build_service(svc)
+            .unwrap();
+
+        Self {
+            inner: Buffer::new(svc, 1).unwrap(),
+            _phan: PhantomData,
+        }
+    }
+}
+
+impl<S, B> Service<Request<B>> for LambdaSvc<S, B>
+where
+    S: Service<Request<B>> + Send + 'static,
+    S::Error: std::error::Error + Send + Sync + 'static,
+    S::Future: Send,
+    B: Send + 'static,
+{
+    type Response = S::Response;
+    type Error = Err;
+    type Future = Box<dyn Future<Item = Self::Response, Error = Self::Error>>;
+
+    fn poll_ready(&mut self) -> Result<Async<()>, Self::Error> {
+        self.inner.poll_ready().map_err(|e| e.into())
+    }
+
+    fn call(&mut self, req: Request<B>) -> Self::Future {
+        let fut = self.inner.call(req);
+        Box::new(fut)
+    }
+}
diff --git a/lambda-runtime-client-simple/src/lib.rs b/lambda-runtime-client-simple/src/lib.rs
new file mode 100644
index 00000000..c17d83de
--- /dev/null
+++ b/lambda-runtime-client-simple/src/lib.rs
@@ -0,0 +1,283 @@
+#[macro_use]
+extern crate serde_derive;
+
+#[macro_use]
+extern crate tokio_trace;
+extern crate tokio_trace_fmt;
+
+use crate::{client::LambdaSvc, settings::Config};
+use hyper::client::HttpConnector;
+use std::{str::FromStr, sync::Arc};
+use tokio_trace::field;
+
+use crate::types::{Context, FunctionArn, InvocationDeadline, RequestId, XRayTraceId};
+use bytes::{buf::FromBuf, Bytes, IntoBuf};
+use futures::{Async, Future, Poll, Sink, Stream};
+use headers::{HeaderMap, HeaderMapExt};
+use http::{
+    uri::{Parts, PathAndQuery, Uri},
+    Request, Response,
+};
+use hyper::{Body, Client};
+use tokio::sync;
+use tokio_trace_fmt::FmtSubscriber;
+use tower::{util::ServiceExt, Service};
+
+pub mod client;
+pub mod settings;
+pub mod types;
+
+#[macro_export]
+/// The helper lambda macro.
+macro_rules! lambda {
+    ($handler:ident) => {
+        $crate::start($handler)
+    };
+}
+
+pub type FutureObj<T, E> = Box<Future<Item = T, Error = E> + Send>;
+pub type Error = Box<dyn std::error::Error + Sync + Send + 'static>;
+
+pub trait Handler<Event, Response>: Send
+where
+    Event: FromBuf,
+    Response: IntoBuf,
+{
+    fn run(&mut self, event: Event) -> FutureObj<Response, Error>;
+}
+
+impl<Event, Response, F> Handler<Event, Response> for F
+where
+    Event: FromBuf,
+    Response: IntoBuf,
+    F: FnMut(Event) -> FutureObj<Response, Error> + Send,
+{
+    fn run(&mut self, event: Event) -> FutureObj<Response, Error> {
+        (self)(event)
+    }
+}
+
+impl<Event, Response: 'static> Service<Event> for Handler<Event, Response>
+where
+    Event: FromBuf,
+    Response: IntoBuf,
+{
+    type Response = Response;
+    type Error = Error;
+    type Future = FutureObj<Self::Response, Self::Error>;
+
+    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
+        Ok(Async::Ready(()))
+    }
+
+    fn call(&mut self, req: Event) -> Self::Future {
+        Box::new(self.run(req))
+    }
+}
+
+fn run<A>(handler: A, config: Config)
+where
+    A: Fn(Body) -> FutureObj<Bytes, Error> + Send + 'static,
+{
+    let uri = config.endpoint.parse::<Uri>().unwrap();
+    let client = RuntimeClient::new(uri);
+    let listener = EventStream::new(client.clone());
+    // Since `EventStream` implements Stream, the `.for_each` combinator is used to
+    // process each incoming event.
+    let (tx, rx) = sync::mpsc::channel(1);
+    let svc = listener
+        .map_err(|e| error!({ error = field::debug(e) }, "error accepting event"))
+        .and_then(move |next_event: Response<Body>| {
+            let client = client.clone();
+            info!({ event = field::debug(&next_event) }, "Received event");
+
+            let (parts, body) = next_event.into_parts();
+            let context = Context::new(parts.headers);
+
+            (handler)(body).into()
+        })
+        .forward(tx)
+        .map_err(drop);
+
+
+    tokio::run(svc);
+}
+
+pub fn start<A>(f: A) -> Result<(), Error>
+where
+    A: Fn(Body) -> FutureObj<Bytes, Error> + Send + 'static,
+{
+    let subscriber = FmtSubscriber::builder().full().finish();
+    tokio_trace::subscriber::with_default(subscriber, || {
+        span!("lambda").enter(|| {
+            info!("Reading config");
+            let config = Config::from_env();
+            info!("read config; launching function");
+            run(f, config);
+        });
+    });
+
+    Ok(())
+}
+
+pub struct EventStream {
+    client: RuntimeClient,
+    current: Option<FutureObj<Response<Body>, Error>>,
+}
+
+impl EventStream {
+    fn new(client: RuntimeClient) -> Self {
+        Self {
+            client,
+            current: None,
+        }
+    }
+
+    fn next_event(&self) -> FutureObj<Response<Body>, Error> {
+        span!("next_event").enter(|| {
+            let fut = self.client.next_event();
+            Box::new(fut.map_err(|e| e.into()))
+        })
+    }
+}
+
+/// The `Stream` implementation for `EventStream` converts a `Future`
+/// containing the next event from the Lambda Runtime into a continuous
+/// stream of events. While _this_ stream will continue to produce
+/// events indefinitely, AWS Lambda will only run the Lambda function attached
+/// to this runtime *if and only if* there is an event available for it to process.
+/// For Lambda functions that receive a “warm wakeup”—i.e., the function is
+/// readily available in the Lambda service's cache—this runtime is able
+/// to immediately fetch the next event.
+impl Stream for EventStream {
+    type Item = Response<Body>;
+    type Error = Error;
+
+    fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
+        // The `loop` is used to drive the inner future (`current`) to completion, advancing
+        // the state of this stream to yield a new `Item`. Loops like the one below are
+        // common in many hand-implemented `Futures` and `Streams`.
+        loop {
+            // The stream first checks an inner future is set. If the future is present,
+            // the _Tokio_ runtime polls the inner future to completition. For more details
+            // on polling asychronous values, refer to the [documentation](https://docs.rs/futures/0.1/futures/future/trait.Future.html#tymethod.poll) on the poll method on `Future`.
+            if self.current.is_some() {
+                match self.current.poll()? {
+                    // If the current inner future signals readiness/that it is complete:
+                    // 1. Create a new Future that represents the _next_ event which will be polled
+                    // by subsequent iterations of this loop.
+                    // 2. Return the current future, yielding the resolved future.
+                    Async::Ready(res) => {
+                        self.current = Some(self.next_event());
+                        return Ok(Async::Ready(res));
+                    }
+                    // Otherwise, the future signals that it's not ready, so we do the same
+                    // to the Tokio runtime.
+                    Async::NotReady => return Ok(Async::NotReady),
+                }
+            // If the future is not set (due to a cold start from inactivity or a fresh deployment),
+            // we set a new Future to be polled in subsequent loops.
+            } else {
+                self.current = Some(self.next_event());
+            }
+        }
+    }
+}
+
+struct EventSink<T, S: Service<T>> {
+    service: S,
+    _phan: std::marker::PhantomData<T>,
+}
+
+#[derive(Clone)]
+pub struct Endpoint {
+    base: Uri,
+}
+
+impl Endpoint {
+    pub fn new(base: Uri) -> Arc<Self> {
+        let e = Self { base };
+        Arc::new(e)
+    }
+
+    pub fn next_event(&self) -> Result<Uri, Error> {
+        let mut parts: Parts = self.base.clone().into_parts();
+
+        let query = PathAndQuery::from_str("/2018-06-01/runtime/invocation/next")?;
+        parts.path_and_query = Some(query);
+
+        Ok(Uri::from_parts(parts)?)
+    }
+
+    pub fn init_error(&self) -> Result<Uri, Error> {
+        let mut parts: Parts = self.base.clone().into_parts();
+
+        let query = PathAndQuery::from_str("/2018-06-01/runtime/init/error")?;
+        parts.path_and_query = Some(query);
+
+        Ok(Uri::from_parts(parts)?)
+    }
+
+    pub fn ok_response(&self, event_id: String) -> Result<Uri, Error> {
+        let mut parts: Parts = self.base.clone().into_parts();
+
+        let query = format!("/2018-06-01/runtime/invocation/{}/response", event_id);
+        let query = PathAndQuery::from_str(&query)?;
+        parts.path_and_query = Some(query);
+
+        Ok(Uri::from_parts(parts)?)
+    }
+
+    pub fn err_response(&self, event_id: String) -> Result<Uri, Error> {
+        let mut parts: Parts = self.base.clone().into_parts();
+
+        let query = format!("/2018-06-01/runtime/invocation/{}/error", event_id);
+        let query = PathAndQuery::from_str(&query)?;
+        parts.path_and_query = Some(query);
+
+        Ok(Uri::from_parts(parts)?)
+    }
+}
+
+#[derive(Clone)]
+struct RuntimeClient {
+    endpoint: Arc<Endpoint>,
+    inner: Client<HttpConnector>,
+}
+
+impl RuntimeClient {
+    pub fn new(base: Uri) -> Self {
+        Self {
+            endpoint: Endpoint::new(base),
+            inner: Client::new(),
+        }
+    }
+
+    pub fn next_event(&self) -> FutureObj<Response<Body>, Error> {
+        let uri = match self.endpoint.next_event() {
+            Ok(uri) => uri,
+            Err(e) => return Box::new(futures::future::err(e)),
+        };
+
+        Box::new(self.inner.get(uri).map_err(|e| e.into()))
+    }
+
+    pub fn complete_event(&self, res: Result<Bytes, Error>) -> FutureObj<Response<Body>, Error> {
+        unimplemented!()
+    }
+}
+
+// Tower's Service is a pleasant abstraction over Futures, clients, and services.
+impl Service<Request<Body>> for RuntimeClient {
+    type Response = Response<Body>;
+    type Error = Error;
+    type Future = Box<dyn Future<Item = Self::Response, Error = Self::Error> + Send>;
+
+    fn poll_ready(&mut self) -> Result<Async<()>, Self::Error> {
+        Ok(Async::Ready(()))
+    }
+
+    fn call(&mut self, req: Request<Body>) -> Self::Future {
+        Box::new(self.inner.request(req).map_err(|e| e.into()))
+    }
+}
diff --git a/lambda-runtime-client-simple/src/settings.rs b/lambda-runtime-client-simple/src/settings.rs
new file mode 100644
index 00000000..889b0a1f
--- /dev/null
+++ b/lambda-runtime-client-simple/src/settings.rs
@@ -0,0 +1,27 @@
+use envy;
+
+#[derive(Serialize, Deserialize, Debug, Default)]
+pub(crate) struct Config {
+    #[serde(rename = "AWS_LAMBDA_RUNTIME_API")]
+    pub endpoint: String,
+    #[serde(rename = "AWS_LAMBDA_FUNCTION_NAME")]
+    pub function_name: String,
+    #[serde(rename = "AWS_LAMBDA_FUNCTION_MEMORY_SIZE")]
+    pub memory: i32,
+    #[serde(rename = "AWS_LAMBDA_FUNCTION_VERSION")]
+    pub version: String,
+    #[serde(rename = "AWS_LAMBDA_LOG_STREAM_NAME")]
+    pub log_stream: String,
+    #[serde(rename = "AWS_LAMBDA_LOG_GROUP_NAME")]
+    pub log_group: String,
+}
+
+impl Config {
+    pub(crate) fn from_env() -> Self {
+        Config {
+            endpoint: std::env::var("AWS_LAMBDA_RUNTIME_API").unwrap(),
+            function_name: std::env::var("AWS_LAMBDA_FUNCTION_NAME").unwrap(),
+            ..Config::default()
+        }
+    }
+}
diff --git a/lambda-runtime-client-simple/src/types.rs b/lambda-runtime-client-simple/src/types.rs
new file mode 100644
index 00000000..00b27f44
--- /dev/null
+++ b/lambda-runtime-client-simple/src/types.rs
@@ -0,0 +1,363 @@
+use headers::{Header, HeaderMap, HeaderMapExt, HeaderName, HeaderValue};
+use lazy_static::lazy_static;
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+
+lazy_static! {
+    static ref AWS_REQUEST_ID: HeaderName =
+        HeaderName::from_static("lambda-runtime-aws-request-id");
+    static ref AWS_INVOCATION_DEADLINE: HeaderName =
+        HeaderName::from_static("lambda-runtime-deadline-ms");
+    static ref AWS_FUNCTION_ARN: HeaderName =
+        HeaderName::from_static("lambda-runtime-invoked-function-arn");
+    static ref AWS_XRAY_TRACE_ID: HeaderName = HeaderName::from_static("lambda-runtime-trace-id");
+    static ref AWS_MOBILE_CLIENT_CONTEXT: HeaderName =
+        HeaderName::from_static("lambda-runtime-client-context");
+    static ref AWS_MOBILE_CLIENT_IDENTITY: HeaderName =
+        HeaderName::from_static("lambda-runtime-cognito-identity");
+}
+
+macro_rules! str_header {
+    ($type:tt, $header_name:ident) => {
+        impl Header for $type {
+            fn name() -> &'static HeaderName {
+                &$header_name
+            }
+
+            fn decode<'i, I>(values: &mut I) -> Result<Self, headers::Error>
+            where
+                I: Iterator<Item = &'i HeaderValue>,
+            {
+                let value = values
+                    .next()
+                    .and_then(|val| {
+                        if let Ok(val) = val.to_str() {
+                            return Some(String::from(val));
+                        }
+                        None
+                    })
+                    .ok_or_else(headers::Error::invalid)?;
+                Ok($type(value))
+            }
+
+            fn encode<E>(&self, values: &mut E)
+            where
+                E: Extend<HeaderValue>,
+            {
+                let value = HeaderValue::from_str(&self.0).expect("Should not panic on encoding");
+                values.extend(std::iter::once(value));
+            }
+        }
+    };
+}
+
+macro_rules! num_header {
+    ($type:tt, $header_name:ident) => {
+        impl Header for $type {
+            fn name() -> &'static HeaderName {
+                &$header_name
+            }
+
+            fn decode<'i, I>(values: &mut I) -> Result<Self, headers::Error>
+            where
+                I: Iterator<Item = &'i HeaderValue>,
+            {
+                let value = values
+                    .next()
+                    .and_then(|val| {
+                        if let Ok(val) = val.to_str() {
+                            if let Ok(val) = val.parse::<u64>() {
+                                return Some(val);
+                            }
+                        }
+                        None
+                    })
+                    .ok_or_else(headers::Error::invalid)?;
+                Ok($type(value))
+            }
+
+            fn encode<E>(&self, values: &mut E)
+            where
+                E: Extend<HeaderValue>,
+            {
+                let value = HeaderValue::from_str(&self.0.to_string())
+                    .expect("Should not panic on encoding");
+                values.extend(std::iter::once(value));
+            }
+        }
+    };
+}
+
+/// The request ID, which identifies the request that triggered the function invocation. This header
+/// tracks the invocation within the Lambda control plane. The request ID is used to specify completion
+/// of a given invocation.
+#[derive(Debug, Clone, PartialEq)]
+pub struct RequestId(pub String);
+str_header!(RequestId, AWS_REQUEST_ID);
+
+/// The date that the function times out in Unix time milliseconds. For example, `1542409706888`.
+#[derive(Debug, Clone, PartialEq)]
+pub struct InvocationDeadline(pub u64);
+num_header!(InvocationDeadline, AWS_INVOCATION_DEADLINE);
+
+/// The ARN of the Lambda function, version, or alias that is specified in the invocation.
+/// For instance, `arn:aws:lambda:us-east-2:123456789012:function:custom-runtime`.
+#[derive(Debug, Clone, PartialEq)]
+pub struct FunctionArn(pub String);
+str_header!(FunctionArn, AWS_FUNCTION_ARN);
+
+/// The AWS X-Ray Tracing header. For more information,
+/// please see [AWS' documentation](https://docs.aws.amazon.com/xray/latest/devguide/xray-concepts.html#xray-concepts-tracingheader).
+#[derive(Debug, Clone, PartialEq)]
+pub struct XRayTraceId(pub String);
+str_header!(XRayTraceId, AWS_XRAY_TRACE_ID);
+
+/// For invocations from the AWS Mobile SDK contains data about client application and device.
+#[derive(Debug, Clone, PartialEq)]
+struct MobileClientContext(String);
+str_header!(MobileClientContext, AWS_MOBILE_CLIENT_CONTEXT);
+
+/// For invocations from the AWS Mobile SDK, data about the Amazon Cognito identity provider.
+#[derive(Debug, Clone, PartialEq)]
+struct MobileClientIdentity(String);
+str_header!(MobileClientIdentity, AWS_MOBILE_CLIENT_IDENTITY);
+
+/// Client context sent by the AWS Mobile SDK.
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+pub struct ClientContext {
+    /// Information about the mobile application invoking the function.
+    pub client: ClientApplication,
+    /// Custom properties attached to the mobile event context.
+    pub custom: HashMap<String, String>,
+    /// Environment settings from the mobile client.
+    pub environment: HashMap<String, String>,
+}
+
+/// AWS Mobile SDK client fields.
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct ClientApplication {
+    /// The mobile app installation id
+    pub installation_id: String,
+    /// The app title for the mobile app as registered with AWS' mobile services.
+    pub app_title: String,
+    /// The version name of the application as registered with AWS' mobile services.
+    pub app_version_name: String,
+    /// The app version code.
+    pub app_version_code: String,
+    /// The package name for the mobile application invoking the function
+    pub app_package_name: String,
+}
+
+/// Cognito identity information sent with the event
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+pub struct CognitoIdentity {
+    /// The unique identity id for the Cognito credentials invoking the function.
+    pub identity_id: String,
+    /// The identity pool id the caller is "registered" with.
+    pub identity_pool_id: String,
+}
+
+/// The Lambda function execution context. The values in this struct
+/// are populated using the [Lambda environment variables](https://docs.aws.amazon.com/lambda/latest/dg/current-supported-versions.html)
+/// and the headers returned by the poll request to the Runtime APIs.
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Default)]
+pub struct Context {
+    /// The AWS request ID generated by the Lambda service.
+    pub aws_request_id: String,
+    /// The execution deadline for the current invocation in milliseconds.
+    pub deadline: u64,
+    /// The ARN of the Lambda function being invoked.
+    pub invoked_function_arn: String,
+    /// The X-Ray trace ID for the current invocation.
+    pub xray_trace_id: Option<String>,
+    /// The client context object sent by the AWS mobile SDK. This field is
+    /// empty unless the function is invoked using an AWS mobile SDK.
+    pub client_context: Option<ClientContext>,
+    /// The Cognito identity that invoked the function. This field is empty
+    /// unless the invocation request to the Lambda APIs was made using AWS
+    /// credentials issues by Amazon Cognito Identity Pools.
+    pub identity: Option<CognitoIdentity>,
+}
+
+impl Context {
+    pub fn new(headers: HeaderMap<HeaderValue>) -> Option<Self> {
+        let request_id = headers.typed_get::<RequestId>()?;
+        let function_arn = headers.typed_get::<FunctionArn>()?;
+        let deadline = headers.typed_get::<InvocationDeadline>()?;
+        let xray = headers.typed_get::<XRayTraceId>();
+
+        let ctx = Context {
+            aws_request_id: request_id.0,
+            deadline: deadline.0,
+            invoked_function_arn: function_arn.0,
+            xray_trace_id: xray.map(|v| v.0),
+            ..Default::default()
+        };
+        Some(ctx)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::types::{
+        ClientApplication, ClientContext, CognitoIdentity, FunctionArn, InvocationDeadline,
+        MobileClientContext, MobileClientIdentity, RequestId, XRayTraceId,
+    };
+    use bytes::Bytes;
+    use headers::{HeaderMap, HeaderMapExt};
+    use http::Response;
+    use proptest::{collection, option, prelude::*, strategy::Strategy, string::string_regex};
+
+    fn gen_request_id() -> impl Strategy<Value = RequestId> {
+        let expr = "[0-9A-F]{8}-[0-9A-F]{4}-4[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}";
+        let arbitrary_uuid = string_regex(expr).unwrap();
+        arbitrary_uuid.prop_map(RequestId)
+    }
+
+    fn gen_invocation_deadline() -> impl Strategy<Value = InvocationDeadline> {
+        any::<u64>().prop_map(InvocationDeadline)
+    }
+
+    fn gen_function_arn() -> impl Strategy<Value = FunctionArn> {
+        let expr = "arn:aws:lambda:us-east-1:[0-9]{12}:function:custom-runtime";
+        let arn = string_regex(expr).unwrap();
+        arn.prop_map(FunctionArn)
+    }
+
+    fn gen_xray_trace_id() -> impl Strategy<Value = XRayTraceId> {
+        let expr = "Root=1-[a-zA-Z0-9]{32};Parent=[a-z0-9]{16};Sampled=[0-1]{1}";
+        let xray = string_regex(expr).unwrap();
+        xray.prop_map(XRayTraceId)
+    }
+
+    fn uuid() -> impl Strategy<Value = String> {
+        let expr = "[a-zA-Z0-9]{32}";
+        string_regex(expr).unwrap()
+    }
+
+    fn gen_client_context() -> impl Strategy<Value = MobileClientContext> {
+        uuid().prop_map(MobileClientContext)
+    }
+
+    fn gen_client_identity() -> impl Strategy<Value = MobileClientIdentity> {
+        uuid().prop_map(MobileClientIdentity)
+    }
+
+    fn gen_client_identity_struct() -> impl Strategy<Value = CognitoIdentity> {
+        (uuid()).prop_map(|uuid| CognitoIdentity {
+            identity_id: uuid.clone(),
+            identity_pool_id: uuid,
+        })
+    }
+
+    fn gen_client_application() -> impl Strategy<Value = ClientApplication> {
+        (uuid()).prop_map(|uuid| ClientApplication {
+            installation_id: uuid.clone(),
+            app_title: uuid.clone(),
+            app_version_name: uuid.clone(),
+            app_version_code: uuid.clone(),
+            app_package_name: uuid,
+        })
+    }
+
+    fn gen_client_context_struct() -> impl Strategy<Value = ClientContext> {
+        let app = gen_client_application();
+        let overrides = collection::hash_map(uuid(), uuid(), 1..10);
+        let env = collection::hash_map(uuid(), uuid(), 1..10);
+        (app, overrides, env).prop_map(|args| {
+            let (app, overrides, env) = args;
+            ClientContext {
+                client: app,
+                custom: overrides,
+                environment: env,
+            }
+        })
+    }
+
+    fn gen_headers() -> impl Strategy<Value = HeaderMap> {
+        let mandatory = (
+            gen_request_id(),
+            gen_invocation_deadline(),
+            gen_function_arn(),
+        );
+        let xray = option::of(gen_xray_trace_id());
+        let mobile = option::of((gen_client_context(), gen_client_identity()));
+        (mandatory, xray, mobile).prop_map(|headers| {
+            let (mandatory, xray, mobile) = headers;
+            let mut map = HeaderMap::new();
+            map.typed_insert(mandatory.0);
+            map.typed_insert(mandatory.1);
+            map.typed_insert(mandatory.2);
+            xray.map(|xray| map.typed_insert(xray));
+            mobile.map(|mobile| {
+                map.typed_insert(mobile.0);
+                map.typed_insert(mobile.1)
+            });
+            map
+        })
+    }
+
+    fn gen_next_event() -> impl Strategy<Value = Response<Bytes>> {
+        gen_headers().prop_map(|headers| {
+            let mut resp = Response::new(Bytes::default());
+            *resp.headers_mut() = headers;
+            *resp.status_mut() = http::StatusCode::OK;
+            resp
+        })
+    }
+
+    #[test]
+    fn request_id() {
+        proptest!(|(req in gen_request_id())| {
+            let mut headers = HeaderMap::new();
+            headers.typed_insert(req.clone());
+            prop_assert_eq!(headers.typed_get::<RequestId>(), Some(req));
+        });
+    }
+
+    #[test]
+    fn deadline() {
+        proptest!(|(req in gen_invocation_deadline())| {
+            let mut headers = HeaderMap::new();
+            headers.typed_insert(req.clone());
+            prop_assert_eq!(headers.typed_get::<InvocationDeadline>(), Some(req));
+        });
+    }
+
+    #[test]
+    fn function_arn() {
+        proptest!(|(req in gen_function_arn())| {
+            let mut headers = HeaderMap::new();
+            headers.typed_insert(req.clone());
+            prop_assert_eq!(headers.typed_get::<FunctionArn>(), Some(req));
+        });
+    }
+
+    #[test]
+    fn xray_trace_id() {
+        proptest!(|(req in gen_xray_trace_id())| {
+            let mut headers = HeaderMap::new();
+            headers.typed_insert(req.clone());
+            prop_assert_eq!(headers.typed_get::<XRayTraceId>(), Some(req));
+        });
+    }
+
+    #[test]
+    fn mobile_client_context() {
+        proptest!(|(req in gen_client_context())| {
+            let mut headers = HeaderMap::new();
+            headers.typed_insert(req.clone());
+            prop_assert_eq!(headers.typed_get::<MobileClientContext>(), Some(req));
+        });
+    }
+
+    #[test]
+    fn mobile_client_identity() {
+        proptest!(|(req in gen_client_identity())| {
+            let mut headers = HeaderMap::new();
+            headers.typed_insert(req.clone());
+            prop_assert_eq!(headers.typed_get::<MobileClientIdentity>(), Some(req));
+        });
+    }
+}
diff --git a/lambda-runtime-client/src/client.rs b/lambda-runtime-client/src/client.rs
index f87a2d2c..1eebd126 100644
--- a/lambda-runtime-client/src/client.rs
+++ b/lambda-runtime-client/src/client.rs
@@ -242,7 +242,10 @@ impl RuntimeClient {
                 Ok(())
             }
             Err(e) => {
-                error!("Error when calling runtime API for request {}: {}", request_id, e);
+                error!(
+                    "Error when calling runtime API for request {}: {}",
+                    request_id, e
+                );
                 Err(ApiError::from(e))
             }
         }
@@ -290,7 +293,10 @@ impl RuntimeClient {
                 Ok(())
             }
             Err(e) => {
-                error!("Error when calling runtime API for request {}: {}", request_id, e);
+                error!(
+                    "Error when calling runtime API for request {}: {}",
+                    request_id, e
+                );
                 Err(ApiError::from(e))
             }
         }
@@ -308,10 +314,16 @@ impl RuntimeClient {
     /// If it cannot send the init error. In this case we panic to force the runtime
     /// to restart.
     pub fn fail_init(&self, e: &dyn RuntimeApiError) {
-        let uri: Uri = format!("http://{}/{}/runtime/init/error", self.endpoint, RUNTIME_API_VERSION)
-            .parse()
-            .expect("Could not generate Runtime URI");
-        error!("Calling fail_init Runtime API: {}", e.to_response().error_message);
+        let uri: Uri = format!(
+            "http://{}/{}/runtime/init/error",
+            self.endpoint, RUNTIME_API_VERSION
+        )
+        .parse()
+        .expect("Could not generate Runtime URI");
+        error!(
+            "Calling fail_init Runtime API: {}",
+            e.to_response().error_message
+        );
         let req = self.get_runtime_error_request(&uri, &e.to_response());
 
         self.http_client
@@ -322,7 +334,10 @@ impl RuntimeClient {
                 panic!("Error while sending init failed message: {}", e);
             })
             .map(|resp| {
-                info!("Successfully sent error response to the runtime API: {:?}", resp);
+                info!(
+                    "Successfully sent error response to the runtime API: {:?}",
+                    resp
+                );
             })
             .expect("Could not complete init_fail request");
     }
@@ -348,7 +363,10 @@ impl RuntimeClient {
         Request::builder()
             .method(Method::POST)
             .uri(uri.clone())
-            .header(header::CONTENT_TYPE, header::HeaderValue::from_static(API_CONTENT_TYPE))
+            .header(
+                header::CONTENT_TYPE,
+                header::HeaderValue::from_static(API_CONTENT_TYPE),
+            )
             .body(Body::from(body))
             .unwrap()
     }
@@ -362,7 +380,10 @@ impl RuntimeClient {
                 header::CONTENT_TYPE,
                 header::HeaderValue::from_static(API_ERROR_CONTENT_TYPE),
             )
-            .header(RUNTIME_ERROR_HEADER, HeaderValue::from_static("RuntimeError")) // TODO: We should add this code to the error object.
+            .header(
+                RUNTIME_ERROR_HEADER,
+                HeaderValue::from_static("RuntimeError"),
+            ) // TODO: We should add this code to the error object.
             .body(Body::from(body))
             .unwrap()
     }
@@ -378,14 +399,20 @@ impl RuntimeClient {
     /// A `Result` containing the populated `EventContext` or an `ApiError` if the required headers
     /// were not present or the client context and cognito identity could not be parsed from the
     /// JSON string.
-    fn get_event_context(&self, headers: &HeaderMap<HeaderValue>) -> Result<EventContext, ApiError> {
+    fn get_event_context(
+        &self,
+        headers: &HeaderMap<HeaderValue>,
+    ) -> Result<EventContext, ApiError> {
         // let headers = resp.headers();
 
         let aws_request_id = match headers.get(LambdaHeaders::RequestId.as_str()) {
             Some(value) => value.to_str()?.to_owned(),
             None => {
                 error!("Response headers do not contain request id header");
-                return Err(ApiError::new(&format!("Missing {} header", LambdaHeaders::RequestId)));
+                return Err(ApiError::new(&format!(
+                    "Missing {} header",
+                    LambdaHeaders::RequestId
+                )));
             }
         };
 
@@ -393,7 +420,10 @@ impl RuntimeClient {
             Some(value) => value.to_str()?.to_owned(),
             None => {
                 error!("Response headers do not contain function arn header");
-                return Err(ApiError::new(&format!("Missing {} header", LambdaHeaders::FunctionArn)));
+                return Err(ApiError::new(&format!(
+                    "Missing {} header",
+                    LambdaHeaders::FunctionArn
+                )));
             }
         };
 
@@ -401,7 +431,10 @@ impl RuntimeClient {
             Some(value) => value.to_str()?.to_owned(),
             None => {
                 error!("Response headers do not contain trace id header");
-                return Err(ApiError::new(&format!("Missing {} header", LambdaHeaders::TraceId)));
+                return Err(ApiError::new(&format!(
+                    "Missing {} header",
+                    LambdaHeaders::TraceId
+                )));
             }
         };
 
@@ -409,7 +442,10 @@ impl RuntimeClient {
             Some(value) => value.to_str()?.parse()?,
             None => {
                 error!("Response headers do not contain deadline header");
-                return Err(ApiError::new(&format!("Missing {} header", LambdaHeaders::Deadline)));
+                return Err(ApiError::new(&format!(
+                    "Missing {} header",
+                    LambdaHeaders::Deadline
+                )));
             }
         };
 
@@ -431,7 +467,10 @@ impl RuntimeClient {
 
         if let Some(cognito_json) = headers.get(LambdaHeaders::CognitoIdentity.as_str()) {
             let cognito_json = cognito_json.to_str()?;
-            trace!("Found Cognito Identity in response headers: {}", cognito_json);
+            trace!(
+                "Found Cognito Identity in response headers: {}",
+                cognito_json
+            );
             let identity_value: CognitoIdentity = serde_json::from_str(&cognito_json)?;
             ctx.identity = Option::from(identity_value);
         };
diff --git a/lambda-runtime-client/src/error.rs b/lambda-runtime-client/src/error.rs
index 6dd5356e..6b49c30f 100644
--- a/lambda-runtime-client/src/error.rs
+++ b/lambda-runtime-client/src/error.rs
@@ -175,7 +175,10 @@ impl From<io::Error> for ApiError {
 impl RuntimeApiError for ApiError {
     fn to_response(&self) -> ErrorResponse {
         let backtrace = format!("{:?}", self.backtrace);
-        let trace_vec = backtrace.lines().map(|s| s.to_string()).collect::<Vec<String>>();
+        let trace_vec = backtrace
+            .lines()
+            .map(|s| s.to_string())
+            .collect::<Vec<String>>();
         let mut err = ErrorResponse::unhandled(self.msg.clone());
         err.stack_trace = Option::from(trace_vec);
 
diff --git a/lambda-runtime/Cargo.toml b/lambda-runtime/Cargo.toml
index ef1cf7ec..cc5b1758 100644
--- a/lambda-runtime/Cargo.toml
+++ b/lambda-runtime/Cargo.toml
@@ -17,8 +17,8 @@ maintenance = { status = "actively-developed" }
 
 [dependencies]
 serde = "^1"
-serde_json = "^1"
 serde_derive = "^1"
+serde_json = "^1"
 log = "^0.4"
 hyper = "^0.12"
 tokio = "^0.1"
diff --git a/lambda-runtime/src/error.rs b/lambda-runtime/src/error.rs
index 975d7919..adde610a 100644
--- a/lambda-runtime/src/error.rs
+++ b/lambda-runtime/src/error.rs
@@ -71,7 +71,12 @@ impl error::RuntimeApiError for RuntimeError {
         error::ErrorResponse {
             error_message: String::from(self.description()),
             error_type: String::from(error::ERROR_TYPE_HANDLED),
-            stack_trace: Option::from(backtrace.lines().map(|s| s.to_string()).collect::<Vec<String>>()),
+            stack_trace: Option::from(
+                backtrace
+                    .lines()
+                    .map(|s| s.to_string())
+                    .collect::<Vec<String>>(),
+            ),
         }
     }
 }
@@ -174,7 +179,12 @@ impl error::RuntimeApiError for HandlerError {
         error::ErrorResponse {
             error_message: String::from(self.description()),
             error_type: String::from(error::ERROR_TYPE_HANDLED),
-            stack_trace: Option::from(backtrace.lines().map(|s| s.to_string()).collect::<Vec<String>>()),
+            stack_trace: Option::from(
+                backtrace
+                    .lines()
+                    .map(|s| s.to_string())
+                    .collect::<Vec<String>>(),
+            ),
         }
     }
 }
diff --git a/lambda-runtime/src/runtime.rs b/lambda-runtime/src/runtime.rs
index caac0983..26d4b017 100644
--- a/lambda-runtime/src/runtime.rs
+++ b/lambda-runtime/src/runtime.rs
@@ -73,8 +73,11 @@ macro_rules! lambda {
 /// The function panics if the `ConfigProvider` returns an error from the `get_runtime_api_endpoint()`
 /// or `get_function_settings()` methods. The panic forces AWS Lambda to terminate the environment
 /// and spin up a new one for the next invocation.
-pub(crate) fn start_with_config<E, O, C>(f: impl Handler<E, O>, config: &C, runtime: Option<TokioRuntime>)
-where
+pub(crate) fn start_with_config<E, O, C>(
+    f: impl Handler<E, O>,
+    config: &C,
+    runtime: Option<TokioRuntime>,
+) where
     E: serde::de::DeserializeOwned,
     O: serde::Serialize,
     C: ConfigProvider,
@@ -212,12 +215,20 @@ where
                     );
                     match serde_json::to_vec(&response) {
                         Ok(response_bytes) => {
-                            match self.runtime_client.event_response(&request_id, response_bytes) {
-                                Ok(_) => info!("Response for {} accepted by Runtime API", request_id),
+                            match self
+                                .runtime_client
+                                .event_response(&request_id, response_bytes)
+                            {
+                                Ok(_) => {
+                                    info!("Response for {} accepted by Runtime API", request_id)
+                                }
                                 // unrecoverable error while trying to communicate with the endpoint.
                                 // we let the Lambda Runtime API know that we have died
                                 Err(e) => {
-                                    error!("Could not send response for {} to Runtime API: {}", request_id, e);
+                                    error!(
+                                        "Could not send response for {} to Runtime API: {}",
+                                        request_id, e
+                                    );
                                     if !e.recoverable {
                                         error!(
                                             "Error for {} is not recoverable, sending fail_init signal and panicking.",
@@ -242,11 +253,17 @@ where
                 }
                 Err(e) => {
                     debug!("Handler returned an error for {}: {}", request_id, e);
-                    debug!("Attempting to send error response to Runtime API for {}", request_id);
+                    debug!(
+                        "Attempting to send error response to Runtime API for {}",
+                        request_id
+                    );
                     match self.runtime_client.event_error(&request_id, &e) {
                         Ok(_) => info!("Error response for {} accepted by Runtime API", request_id),
                         Err(e) => {
-                            error!("Unable to send error response for {} to Runtime API: {}", request_id, e);
+                            error!(
+                                "Unable to send error response for {} to Runtime API: {}",
+                                request_id, e
+                            );
                             if !e.recoverable {
                                 error!(
                                     "Error for {} is not recoverable, sending fail_init signal and panicking",
@@ -338,7 +355,9 @@ pub(crate) mod tests {
             None,
         )
         .expect("Could not initialize client");
-        let handler = |_e: String, _c: context::Context| -> Result<String, HandlerError> { Ok("hello".to_string()) };
+        let handler = |_e: String, _c: context::Context| -> Result<String, HandlerError> {
+            Ok("hello".to_string())
+        };
         let retries: i8 = 3;
         let runtime = Runtime::new(
             handler,
@@ -364,6 +383,10 @@ pub(crate) mod tests {
             output.err().unwrap()
         );
         let output_string = output.unwrap();
-        assert_eq!(output_string, "hello", "Unexpected output message: {}", output_string);
+        assert_eq!(
+            output_string, "hello",
+            "Unexpected output message: {}",
+            output_string
+        );
     }
 }