code: func NewRoundTripper(tlsConfig *tls.Config, followRedirects, requireSameHostRedirects bool) httpstream.UpgradeRoundTripper {
  	return NewSpdyRoundTripper(tlsConfig, followRedirects, requireSameHostRedirects)
  }
docs: // NewRoundTripper creates a new SpdyRoundTripper that will use
  // the specified tlsConfig.