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net/http: preserve nil values in Header.Clone
ReverseProxy makes a distinction between nil and zero-length header values. Avoid losing nil-ness when cloning a request. Thanks to Christian Mehlmauer for discovering this. Fixes #53423 Fixes CVE-2022-32148 Change-Id: Ice369cdb4712e2d62e25bb881b080847aa4801f5 Reviewed-on: https://go-review.googlesource.com/c/go/+/412857 Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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