HTTP proxy preserves headers' title case

- fixes shadowsocks#491
- ref hyperium/hyper#2313

crates/shadowsocks-service/Cargo.toml

@@ -97,7 +97,7 @@ socket2 = { version = "0.4", features = ["all"] }
 libc = "0.2"
 
 http = { version = "0.2", optional = true }
-hyper = { version = "0.14", optional = true, features = ["full"] }
+hyper = { version = "0.14.7", optional = true, features = ["full"] }
 tower = { version = "0.4", optional = true }
 
 trust-dns-resolver = { version = "0.20.1", optional = true, features = ["serde-config"] }

crates/shadowsocks-service/src/local/http/client_cache.rs

@@ -34,7 +34,10 @@ impl ProxyClientCache {
         }
 
         // Create a new client
-        let client = Client::builder().build::<_, Body>(ProxyConnector::new(self.context.clone(), server.clone()));
+        let client = Client::builder()
+            .http1_preserve_header_case(true)
+            .http1_title_case_headers(true)
+            .build::<_, Body>(ProxyConnector::new(self.context.clone(), server.clone()));
         cache.insert(server_config.addr().clone(), client.clone());
 
         client

crates/shadowsocks-service/src/local/http/server.rs

@@ -51,7 +51,10 @@ impl Http {
 
     /// Run server
     pub async fn run(self, client_config: &ServerAddr, balancer: PingBalancer) -> io::Result<()> {
-        let bypass_client = Client::builder().build::<_, Body>(BypassConnector::new(self.context.clone()));
+        let bypass_client = Client::builder()
+            .http1_preserve_header_case(true)
+            .http1_title_case_headers(true)
+            .build::<_, Body>(BypassConnector::new(self.context.clone()));
 
         let context = self.context.clone();
         let proxy_client_cache = self.proxy_client_cache.clone();
@@ -89,6 +92,8 @@ impl Http {
         let server = match bind_result {
             Ok(builder) => builder
                 .http1_only(true)
+                .http1_preserve_header_case(true)
+                .http1_title_case_headers(true)
                 .tcp_sleep_on_accept_errors(true)
                 .serve(make_service),
             Err(err) => {