Fix chalice did not send content type headers (#3904)

* Fix Chalice did not send content-type headers

* Add release file

Author: DoctorJohn

RELEASE.md

@@ -0,0 +1,5 @@
+Release type: patch
+
+This release fixes that the Chalice HTTP view integration did not set
+appropriate content-type headers for responses, as it's recommended by the
+GraphQL over HTTP specification.

strawberry/chalice/views.py

@@ -124,7 +124,10 @@ def create_response(
         return Response(
             body=self.encode_json(response_data),
             status_code=status_code,
-            headers=sub_response.headers,  # type: ignore[arg-type]
+            headers={
+                "Content-Type": "application/json",
+                **sub_response.headers,
+            },
         )
 
     def execute_request(self, request: Request) -> Response:

tests/http/test_graphql_over_http_spec.py

@@ -29,9 +29,6 @@ async def test_22eb(http_client):
     """
     SHOULD accept application/graphql-response+json and match the content-type
     """
-    if isinstance(http_client, ChaliceHttpClient):
-        pytest.xfail("The Chalice test client does not return any response headers")
-
     response = await http_client.query(
         method="post",
         headers={
@@ -48,9 +45,6 @@ async def test_4655(http_client):
     """
     MUST accept application/json and match the content-type
     """
-    if isinstance(http_client, ChaliceHttpClient):
-        pytest.xfail("The Chalice test client does not return any response headers")
-
     response = await http_client.query(
         method="post",
         headers={
@@ -67,9 +61,6 @@ async def test_47de(http_client):
     """
     SHOULD accept */* and use application/json for the content-type
     """
-    if isinstance(http_client, ChaliceHttpClient):
-        pytest.xfail("The Chalice test client does not return any response headers")
-
     response = await http_client.query(
         method="post",
         headers={
@@ -86,9 +77,6 @@ async def test_80d8(http_client):
     """
     SHOULD assume application/json content-type when accept is missing
     """
-    if isinstance(http_client, ChaliceHttpClient):
-        pytest.xfail("The Chalice test client does not return any response headers")
-
     response = await http_client.query(
         method="post",
         headers={"Content-Type": "application/json"},