fix list comprehension

cloutierMat · cloutierMat · commit 76aa3ea101ef · 2024-07-18T10:45:35.000-06:00
diff --git a/localstack-core/localstack/services/apigateway/next_gen/execute_api/integrations/http.py b/localstack-core/localstack/services/apigateway/next_gen/execute_api/integrations/http.py
@@ -123,7 +123,7 @@ def invoke(self, context: RestApiInvocationContext) -> EndpointResponse:
         default_apigw_headers = self._get_default_headers(context)
 
         multi_value_headers = build_multi_value_headers(invocation_req["headers"])
-        request_headers = {key: ",".join(value) for key, value in multi_value_headers}
+        request_headers = {key: ",".join(value) for key, value in multi_value_headers.items()}
         # TODO: check which headers to pop
         request_headers.pop("Host", None)
         default_apigw_headers.update(request_headers)
