net/http: preserve path escaping in redirects Currently, when performing path sanitization and trailing-slash redirects, we do not populate the RawPath field of the returned URL. As a result, when a URL path is already escaped, our redirect behavior can be rather surprising: - When "/a//b%2fc" is sanitized, it is double-escaped, becoming "/a/b/%252fc". - When doing trailing slash-redirect, "/a%2fb" will lose its escaping, becoming "/a/b/" instead of "/a%2fb/". Fix this by populating the RawPath field. Also updated TestServeWithSlashRedirectForHostPatterns that still uses the old 301 status code rather than 307 after CL 720820. Fixes #79897 Change-Id: Ibdd1f119afdd6824e52185be3852234a6a6a6964 Reviewed-on: https://go-review.googlesource.com/c/go/+/792860 LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Damien Neil <dneil@google.com> Reviewed-by: Nicholas Husin <husin@google.com>
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