// implicitly created by a registered "/route/"
// properly sets the query string in the redirect URL.
// See Issue 17841.
func TestServeWithSlashRedirectKeepsQueryString(t *testing.T) {
	run(t, testServeWithSlashRedirectKeepsQueryString, []testMode{http1Mode})
}
func testServeWithSlashRedirectKeepsQueryString(t *testing.T, mode testMode) {
	writeBackQuery := func(w ResponseWriter, r *Request) {
		fmt.Fprintf(w, "%s", r.URL.RawQuery)
	}