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net/http/httputil: make ReverseProxy send nil Body requests when possible

Brad Fitzpatrick authored 8 years ago

The http.Transport's retry can't retry requests with non-nil
bodies. When cloning an incoming server request into an outgoing
client request, nil out the Body field if the ContentLength is 0. (For
server requests, Body is always non-nil, even for GET, HEAD, etc.)

Also, don't use the deprecated CancelRequest and use Context instead.

And don't set Proto, ProtoMajor, ProtoMinor. Those are ignored in
client requests, which was probably a later documentation
clarification.

Fixes #16036
Updates #16696 (remove useless Proto lines)

Change-Id: I70a869e9bd4bf240c5838e82fb5aa695a539b343
Reviewed-on: https://go-review.googlesource.com/28412


Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>

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