code: func NewSpdyRoundTripper(tlsConfig *tls.Config, followRedirects, requireSameHostRedirects bool) *SpdyRoundTripper {
  	return &SpdyRoundTripper{
  		tlsConfig:                tlsConfig,
  		followRedirects:          followRedirects,
  		requireSameHostRedirects: requireSameHostRedirects,
  	}
  }
docs: // NewSpdyRoundTripper creates a new SpdyRoundTripper that will use
  // the specified tlsConfig. This function is mostly meant for unit tests.