Ben Sully 480277f612 CallResource: don't set Content-Type header if status is 204 (#50780) ...

Grafana's HTTPServer ensures that the Content-Type header is always set
in the response to a CallResource call, but when the status code is
204 No Content this shouldn't be done; the body should be empty and no
Content-Type header should be set.

We ran into this in the Grafana ML plugin where we were sending an empty
response with status 204, but the frontend client saw that the content
type was JSON and tried to parse it, resulting in an error that made it
to the JS console.

2022-11-07 17:25:49 +01:00

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