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net/http: Document Content-Length behavior for servers #23450

@jsha

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@jsha

What version of Go are you using (go version)?

Go 1.9

Does this issue reproduce with the latest release?

Yes.

For a Go HTTP server, we noticed that sometimes it was setting the Content-Length header on responses, and sometimes it was not. The user code for the HTTP server didn't set Content-Length anywhere, so it must be the stdlib code. After some digging in the stdlib code, we found that Content-Length will be automatically set on small response bodies only. It would be good to document this in the net/http godocs.

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    DocumentationIssues describing a change to documentation.FrozenDueToAgeNeedsFixThe path to resolution is known, but the work has not been done.

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