feat: handle 400 error with response message

openfeature/providers/python-provider/gofeatureflag_python_provider/provider.py

@@ -19,6 +19,7 @@
     ErrorCode,
     FlagNotFoundError,
     GeneralError,
+    InvalidContextError,
     OpenFeatureError,
     TypeMismatchError,
 )
@@ -210,16 +211,29 @@ def generic_go_feature_flag_resolver(
                     body=goff_request.model_dump_json(),
                 )
 
+                response_body = response.data
+
+                # Handle 404 error code
                 if response.status == HTTPStatus.NOT_FOUND.value:
                     raise FlagNotFoundError(
                         "flag {} was not found in your configuration".format(flag_key)
                     )
 
-                if int(response.status) >= HTTPStatus.BAD_REQUEST.value:
+                # Handle 400 error code
+                if int(response.status) == HTTPStatus.BAD_REQUEST.value:
+                    response_dict = json.loads(response_body)
+                    error_message = response_dict.get("message")
+
+                    if error_message is None:
+                        error_message = "no error message given."
+
+                    raise InvalidContextError("Invalid context: " + error_message)
+
+                # Handle every error response above 400
+                if int(response.status) > HTTPStatus.BAD_REQUEST.value:
                     raise GeneralError(
                         "impossible to contact GO Feature Flag relay proxy instance"
                     )
-                response_body = response.data
 
             response_flag_evaluation = ResponseFlagEvaluation.model_validate_json(
                 response_body