net/http/cgi: the PATH_INFO should be empty or start with a slash
fixed PATH_INFO not starting with a slash as described in RFC 3875
for PATH_INFO.
Fixes #63925
Change-Id: I1ead98dff190c53eb7a50546569ef6ded3199a0a
GitHub-Last-Rev:
1c532e330b0d74ee42afc412611a005bc565bb26
GitHub-Pull-Request: golang/go#63926
Reviewed-on: https://go-review.googlesource.com/c/go/+/539615
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Damien Neil <dneil@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>