// Transports are safe for concurrent use by multiple goroutines.
//
// A Transport is a low-level primitive for making HTTP and HTTPS requests.
// For high-level functionality, such as cookies and redirects, see [Client].
//
// Transport uses HTTP/1.1 for HTTP URLs and either HTTP/1.1 or HTTP/2
// for HTTPS URLs, depending on whether the server supports HTTP/2,

		}
	}

	for _, location := range rule.FromCookies {
		if len(location) == 0 {
			errs = multierror.Append(errs, errors.New("cookie name must be non-empty string"))
		}
	}

	for _, claimAndHeaders := range rule.OutputClaimToHeaders {
		if claimAndHeaders == nil {