net/http/httputil: don't append to X-Forwarded-For in ReverseProxy when nil
Fixes #38079 Change-Id: Iac02d7f9574061bb26d1d9a41bb6ee6cc38934e5 Reviewed-on: https://go-review.googlesource.com/c/go/+/230937 Reviewed-by:Ian Lance Taylor <iant@golang.org>
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