Don't validate response for status 304(Not Modified)

lib/committee/middleware/response_validation.rb

@@ -38,7 +38,16 @@ def handle(request)
 
       class << self
         def validate?(status, validate_success_only)
-          status != 204 && (!validate_success_only || (200...300).include?(status))
+          case status
+          when 204
+            false
+          when 200..299
+            true
+          when 304
+            false
+          else
+            !validate_success_only
+          end
         end
       end
 

lib/committee/schema_validator/hyper_schema/response_validator.rb

@@ -14,7 +14,7 @@ def initialize(link, options = {})
         end
 
         def call(status, headers, data)
-          unless status == 204 # 204 No Content
+          unless [204, 304].include?(status) # 204 No Content or 304 Not Modified
             response = Rack::Response.new(data, status, headers)
             check_content_type!(response)
           end

test/middleware/response_validation_open_api_3_test.rb

@@ -64,6 +64,12 @@ def app
     assert_equal 204, last_response.status
   end
 
+  it "passes through a 304 (not modified) response" do
+    @app = new_response_rack("", {}, {schema: open_api_3_schema}, {status: 304})
+    post "/validate"
+    assert_equal 304, last_response.status
+  end
+
   it "passes through a valid response with prefix" do
     @app = new_response_rack(JSON.generate(CHARACTERS_RESPONSE), {}, schema: open_api_3_schema, prefix: "/v1")
     get "/v1/characters"

test/middleware/response_validation_test.rb

@@ -85,6 +85,12 @@ def app
     assert_equal 204, last_response.status
   end
 
+  it "passes through a 304 (not modified) response" do
+    @app = new_rack_app("", {}, app_status: 304, schema: hyper_schema)
+    get "/apps"
+    assert_equal 304, last_response.status
+  end
+
   it "skip validation when 4xx" do
     @app = new_rack_app("[{x:y}]", {}, schema: hyper_schema, validate_success_only: true, app_status: 400)
     get "/apps"

test/schema_validator/hyper_schema/response_validator_test.rb

@@ -38,6 +38,11 @@
     call
   end
 
+  it "passes through a 304 Not Modified response" do
+    @status, @headers, @data = 304, {}, nil
+    call
+  end
+
   it "passes through a valid list response for for rel instances links" do
     @link = @list_link
 
@@ -91,6 +96,11 @@
     call
   end
 
+  it "allows no Content-Type for 304 Not Modified" do
+    @status, @headers = 304, {}
+    call
+  end
+
   it "raises errors generated by json_schema" do
     @data.merge!("name" => "%@!")
     e = assert_raises(Committee::InvalidResponse) { call }

test/schema_validator/open_api_3/response_validator_test.rb

@@ -67,6 +67,11 @@
     call_response_validator
   end
 
+  it "passes through a 304 Not Modified response" do
+    @status, @headers, @data = 304, {}, nil
+    call_response_validator
+  end
+
   private
 
   def call_response_validator(strict = false)