[release-branch.go1.12] net/http: avoid writing to Transport.ProxyConnectHeader
Previously, we accidentally wrote the Proxy-Authorization header for
the initial CONNECT request to the shared ProxyConnectHeader map when
it was non-nil.
Updates #36431
Fixes #36433
Change-Id: I5cb414f391dddf8c23d85427eb6973f14c949025
Reviewed-on: https://go-review.googlesource.com/c/go/+/213638
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
(cherry picked from commit
249c85d3aab2ad2d0bcbf36efe606fdd66f25c72)
Reviewed-on: https://go-review.googlesource.com/c/go/+/213677