Instead of using strings.ToLower and == to check case insensitive
equality, just use strings.EqualFold, even when the strings are only
ASCII. This prevents us unnecessarily lowering extremely long strings,
which can be a somewhat expensive operation, even if we're only
attempting to compare equality with five characters.
Thanks to Guido Vranken for reporting this issue.
Fixesgolang/go#70906
Fixes CVE-2024-45338
Change-Id: I323b919f912d60dab6a87cadfdcac3e6b54cd128
Reviewed-on: https://go-review.googlesource.com/c/net/+/637536
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Gopher Robot <gobot@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Tatiana Bradley <tatianabradley@google.com>