APPEX-243: adds case-insensitive handling for HTTP header titles

.rubocop.yml

@@ -6,7 +6,7 @@ AllCops:
     - vendor/**/*
     - examples/**/*
 
-Metrics/LineLength:
+Layout/LineLength:
   Max: 120
 
 Metrics/AbcSize:

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## Next Release
 Your contribution here.
 
+* [#167](https://github.com/bigcommerce/bigcommerce-api-ruby/pull/000): Changes handling of HTTP response headers to handle lowercased titles. - [@bc-zachary](https://github.com/bc-zachary).
 * [#000](https://github.com/bigcommerce/bigcommerce-api-ruby/pull/000): Brief description here. - [@username](https://github.com/username).
 
 ## 1.0.1

lib/bigcommerce/exception.rb

@@ -1,6 +1,7 @@
 module Bigcommerce
   class HttpError < StandardError
     attr_accessor :response_headers
+
     def initialize(headers)
       @response_headers = headers
     end
@@ -41,17 +42,13 @@ module HttpErrors
 
     def throw_http_exception!(code, env)
       return unless ERRORS.keys.include? code
-      response_headers = {}
-      unless env.body.empty?
-        response_headers = begin
-          JSON.parse(env.body, symbolize_names: true)
-        rescue StandardError
-          {}
-        end
-      end
-      unless env[:response_headers] && env[:response_headers]['X-Retry-After'].nil?
-        response_headers[:retry_after] = env[:response_headers]['X-Retry-After'].to_i
+
+      response_headers = Faraday::Utils::Headers.new(env.response_headers)
+
+      unless response_headers['x-retry-after'].nil?
+        response_headers[:retry_after] = response_headers['x-retry-after'].to_i
       end
+
       raise ERRORS[code].new(response_headers), env.body
     end
   end

spec/bigcommerce/unit/exception_spec.rb

@@ -7,7 +7,7 @@
 
   before do
     allow(env).to receive(:body) { body }
-    allow(env).to receive(:[]) { headers }
+    allow(env).to receive(:response_headers) { headers }
   end
 
   it '::ERRORS is not nil' do
@@ -43,6 +43,20 @@
       end
     end
 
+    context 'when have a body and lowercase response headers' do
+      let(:body) { JSON.generate({ time: '1426184190' }) }
+      let(:headers) { { 'x-retry-after' => 1 } }
+      let(:code) { 429 }
+
+      it 'should parse out a retry-after header if present' do
+        begin
+          dummy_class.throw_http_exception!(code, env)
+        rescue Bigcommerce::TooManyRequests => e
+          expect(e.response_headers[:retry_after]).to eq 1
+        end
+      end
+    end
+
     context 'when we get a string body' do
       let(:body) { 'Unauthorized' }
       let(:code) { 401 }