return NewRoundTripperWithConfig(RoundTripperConfig{
		TLS:              tlsConfig,
		Proxier:          proxier,
		UpgradeTransport: nil,
	})
}

// NewRoundTripperWithConfig creates a new SpdyRoundTripper with the specified
// configuration. Returns an error if the SpdyRoundTripper is misconfigured.
func NewRoundTripperWithConfig(cfg RoundTripperConfig) (*SpdyRoundTripper, error) {

			expectedTLSConfig: &tls.Config{InsecureSkipVerify: true},
		},
	}
	for name, testCase := range testCases {
		t.Run(name, func(t *testing.T) {
			spdyRoundTripper, err := NewRoundTripperWithConfig(
				RoundTripperConfig{
					TLS:              testCase.tlsConfig,
					Proxier:          testCase.proxier,
					UpgradeTransport: testCase.upgradeTransport,
				},
			)
			if testCase.errMsg != "" {