Required: False headers don't give error if missing

connexion/decorators/response.py

@@ -52,9 +52,10 @@ def validate_response(self, data, status_code, headers, url):
 
         if response_definition and response_definition.get("headers"):
             # converting to set is needed to support python 2.7
-            response_definition_header_keys = set(response_definition.get("headers").keys())
+            required_header_keys = {k for (k, v) in response_definition.get("headers").items()
+                                    if 'required' not in v or v['required']}
             header_keys = set(headers.keys())
-            missing_keys = response_definition_header_keys - header_keys
+            missing_keys = required_header_keys - header_keys
             if missing_keys:
                 pretty_list = ', '.join(missing_keys)
                 msg = ("Keys in header don't match response specification. "

tests/fixtures/simple/openapi.yaml

@@ -1157,8 +1157,6 @@ paths:
                 type: string
               required: False
 
-
-
 servers:
   - url: http://localhost:{port}/{basePath}
     variables: