Warning Duplicate definition of 'Content-Type' header

- Remove Content-Type header from the Header sections

features/api_blueprint_documentation.feature

@@ -269,7 +269,6 @@ Feature: Generate API Blueprint documentation from test examples
 
         + Headers
 
-                Content-Type: text/html;charset=utf-8
                 Content-Length: 57
 
         + Body
@@ -288,7 +287,6 @@ Feature: Generate API Blueprint documentation from test examples
 
         + Headers
 
-                Content-Type: application/json
                 Host: example.org
 
         + Body
@@ -308,7 +306,6 @@ Feature: Generate API Blueprint documentation from test examples
 
         + Headers
 
-                Content-Type: application/json
                 Content-Length: 73
 
         + Body
@@ -333,7 +330,6 @@ Feature: Generate API Blueprint documentation from test examples
 
         + Headers
 
-                Content-Type: application/vnd.api+json
                 Content-Length: 137
 
         + Body
@@ -372,13 +368,11 @@ Feature: Generate API Blueprint documentation from test examples
         + Headers
 
                 Host: example.org
-                Content-Type: application/x-www-form-urlencoded
 
     + Response 200 (text/html;charset=utf-8)
 
         + Headers
 
-                Content-Type: text/html;charset=utf-8
                 Content-Length: 0
 
     ### Returns a single order [GET]
@@ -393,7 +387,6 @@ Feature: Generate API Blueprint documentation from test examples
 
         + Headers
 
-                Content-Type: application/json
                 Content-Length: 73
 
         + Body
@@ -412,21 +405,18 @@ Feature: Generate API Blueprint documentation from test examples
 
         + Headers
 
-                Content-Type: application/json; charset=utf-16
                 Host: example.org
 
     + Response 400 (application/json)
 
         + Headers
 
-                Content-Type: application/json
                 Content-Length: 0
 
     + Request Update an order (application/json; charset=utf-16)
 
         + Headers
 
-                Content-Type: application/json; charset=utf-16
                 Host: example.org
 
         + Body
@@ -445,7 +435,6 @@ Feature: Generate API Blueprint documentation from test examples
 
         + Headers
 
-                Content-Type: application/json
                 Content-Length: 111
 
         + Body

lib/rspec_api_documentation/views/api_blueprint_example.rb

@@ -20,14 +20,14 @@ def parameters
 
       def requests
         super.map do |request|
-          request[:request_headers_text]  = remove_utf8_for_json(request[:request_headers_text])
+          request[:request_headers_text]  = remove_utf8_for_json(remove_content_type(request[:request_headers_text]))
           request[:request_headers_text]  = indent(request[:request_headers_text])
           request[:request_content_type]  = content_type(request[:request_headers])
           request[:request_content_type]  = remove_utf8_for_json(request[:request_content_type])
           request[:request_body]          = body_to_json(request, :request)
           request[:request_body]          = indent(request[:request_body])
 
-          request[:response_headers_text] = remove_utf8_for_json(request[:response_headers_text])
+          request[:response_headers_text] = remove_utf8_for_json(remove_content_type(request[:response_headers_text]))
           request[:response_headers_text] = indent(request[:response_headers_text])
           request[:response_content_type] = content_type(request[:response_headers])
           request[:response_content_type] = remove_utf8_for_json(request[:response_content_type])
@@ -46,6 +46,18 @@ def extension
 
       private
 
+      # `Content-Type` header is removed because the information would be duplicated
+      # since it's already present in `request[:request_content_type]`.
+      def remove_content_type(headers)
+        return unless headers
+        headers
+          .split("\n")
+          .reject { |header|
+            header.start_with?('Content-Type:')
+          }
+          .join("\n")
+      end
+
       def has_request?(metadata)
         metadata.any? do |key, value|
           [:request_body, :request_headers, :request_content_type].include?(key) && value

spec/views/api_blueprint_example_spec.rb

@@ -57,17 +57,9 @@
     describe 'request_headers_text' do
       subject { view.requests[0][:request_headers_text] }
 
-      context 'when charset=utf-8 is present' do
-        it "just strips that because it's the default for json" do
-          expect(subject).to eq "Content-Type: application/json\n            Another: header; charset=utf-8"
-        end
-      end
-
-      context 'when charset=utf-16 is present' do
-        let(:content_type) { "application/json; charset=utf-16" }
-
-        it "keeps that because it's NOT the default for json" do
-          expect(subject).to eq "Content-Type: application/json; charset=utf-16\n            Another: header; charset=utf-8"
+      context 'when Content-Type is present' do
+        it "removes it" do
+          expect(subject).to eq "Another: header; charset=utf-8"
         end
       end
     end
@@ -93,17 +85,9 @@
     describe 'response_headers_text' do
       subject { view.requests[0][:response_headers_text] }
 
-      context 'when charset=utf-8 is present' do
-        it "just strips that because it's the default for json" do
-          expect(subject).to eq "Content-Type: application/json\n            Another: header; charset=utf-8"
-        end
-      end
-
-      context 'when charset=utf-16 is present' do
-        let(:content_type) { "application/json; charset=utf-16" }
-
-        it "keeps that because it's NOT the default for json" do
-          expect(subject).to eq "Content-Type: application/json; charset=utf-16\n            Another: header; charset=utf-8"
+      context 'when Content-Type is present' do
+        it "removes it" do
+          expect(subject).to eq "Another: header; charset=utf-8"
         end
       end
     end