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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ResponseValidator: how to handle mime-type with character encoding details?","articleBody":"While using `ResponseValidator.validate` I noticed validation is sensitive to the content-type header including character encoding details. \r\n\r\nIn case an HTTP response includes `content-type: application/json; charset=utf-8` validation fails: `MediaTypeNotFound(mimetype='application/json; charset=utf-8', availableMimetypes=['application/json'])`\r\n\r\n(As quick work I tried adding `application/json; charset=utf-8` to the openapi spec as additional mime-type but that results in vague errors such as raised in https://github.com/p1c2u/openapi-core/issues/128)\r\n\r\nI can manually overwrite `mimetype` of the response before validating but that feels a bit wrong .. one could reason that `application/json; charset=utf-8` should be accepted and treated equal as `application/json`. Any comment?\r\n\r\nSee below for code that reproduces this situation.\r\n\r\n```\r\nimport json\r\nfrom openapi_core import create_spec\r\nfrom openapi_core.validation.request.validators import RequestValidator\r\nfrom openapi_core.validation.response.validators import ResponseValidator\r\nfrom openapi_core.testing import MockRequest\r\nfrom openapi_core.testing import MockResponse\r\n\r\ndef validate(spec_dict, mime_type):\r\n    spec = create_spec(spec_dict)\r\n\r\n    openapi_request = MockRequest('localhost', 'get', '/v1/cars')\r\n    validator = RequestValidator(spec)\r\n    result = validator.validate(openapi_request)\r\n    request_errors = result.errors\r\n\r\n    data = json.dumps({\r\n        'cars' :[\r\n            {\r\n                'name': 'car1',\r\n            },\r\n            {\r\n                'name': 'car2',\r\n            }\r\n        ]\r\n    })\r\n    openapi_response = MockResponse(data, mimetype=mime_type)\r\n\r\n    # Workaround\r\n    #if openapi_response.mimetype == 'application/json; charset=utf-8':\r\n    #     openapi_response.mimetype = 'application/json'\r\n\r\n    validator = ResponseValidator(spec)\r\n    result = validator.validate(openapi_request, openapi_response)\r\n    response_errors = result.errors\r\n\r\n    print('Request errors: {} Response errors: {}'.format(request_errors, response_errors))\r\n\r\n\r\nspec = {\r\n    'openapi': '3.0.0',\r\n    'info': {\r\n        'version': '0.1',\r\n        'title': 'List of objects',\r\n        'description': 'Test for list of objects'\r\n    },\r\n    'paths': {\r\n        '/v1/cars': {\r\n            'get': {\r\n                'description': 'Retrieve all cars',\r\n                'responses': {\r\n                    '200': {\r\n                        'description': 'Successfully retrieved all cars',\r\n                        'content': {\r\n                            'application/json': {\r\n                                'schema': {\r\n                                    'type': 'object',\r\n                                    'properties': {\r\n                                        'cars': {\r\n                                            'type': 'array',\r\n                                            'items': {\r\n                                                '$ref': '#/components/schemas/Car'\r\n                                            }\r\n                                        }\r\n                                    }\r\n                                }\r\n                            }\r\n                        }\r\n                    }\r\n                }\r\n            }\r\n        }\r\n    },\r\n    'components': {\r\n        'schemas': {\r\n            'Car': {\r\n                'type': 'object',\r\n                'properties': {\r\n                    'name': {\r\n                        'type': 'string'\r\n                    }\r\n                }\r\n            }\r\n        }\r\n    }\r\n}\r\nvalidate(spec, 'application/json')\r\nvalidate(spec, 'application/json; charset=utf-8')\r\n```","author":{"url":"https://github.com/erikbos","@type":"Person","name":"erikbos"},"datePublished":"2021-10-31T13:22:04.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/378/openapi-core/issues/378"}