How to set a header on the response in the event of an error?

[steve-marmalade]

Hi team, my use-case is that if there is an error during the processing of the GraphQL request, I would like to set the Cache-Control header to no-store so that the response is not cached.

I see in the Starlette docs that I can add headers to the response like in this example, but the use-case I described above is more complicated because I would need to parse the response body (which might be streamed in chunks?) and check if there is an "errors" key.

I thought the Extension.has_errors lifecycle hook would be perfect for this, but the context object that is provided does not have response object, so I am not sure how to set the header.

Any advice would be appreciated! 🙏

[rafalp]

Hi.

I would recommend creating custom HTTP handler for ASGI app that customizes the create_json_response logic with behaviour you are looking for.