The Go 1.25.2 release made net/url stricter about parsing bracketed IPv6 hostnames, and is rejecting some test URLs used in the autocert TestHTTPHandlerDefaultFallback test with an error about the colon-separated fields requiring at least one hex digit. This commit replaces the invalid `xxxx` portion of some test URLS with valid hex digits, fixing the test regression. Change-Id: I84c192b1cd6daf53ef4199f7987437fd825f7041 Reviewed-on: https://go-review.googlesource.com/c/crypto/+/710155 Reviewed-by: Roland Shoemaker <roland@golang.org> Auto-Submit: Daniel McCarney <daniel@binaryparadox.net> Reviewed-by: Filippo Valsorda <filippo@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>