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net/http: fix ResponseWriter.ReadFrom with short reads
CL 249238 changes ResponseWriter.ReadFrom to probe the source with a single read of sniffLen bytes before writing the response header. If the source returns less than sniffLen bytes without reaching EOF, this can cause Content-Type and Content-Length detection to fail. Fix ResponseWrite.ReadFrom to copy a full sniffLen bytes from the source as a probe. Drop the explicit call to w.WriteHeader; writing the probe will trigger a WriteHeader call. Consistently use io.CopyBuffer; ReadFrom has already acquired a copy buffer, so it may as well use it. Fixes #44953. Change-Id: Ic49305fb827a2bd7da4764b68d64b797b5157dc0 Reviewed-on: https://go-review.googlesource.com/c/go/+/301449 Trust: Damien Neil <dneil@google.com> Run-TryBot: Damien Neil <dneil@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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