}

func (w *http2writePushPromise) writeFrame(ctx http2writeContext) error {
	enc, buf := ctx.HeaderEncoder()
	buf.Reset()

	http2encKV(enc, ":method", w.method)
	http2encKV(enc, ":scheme", w.url.Scheme)
	http2encKV(enc, ":authority", w.url.Host)
	http2encKV(enc, ":path", w.url.RequestURI())
	http2encodeHeaders(enc, w.h, nil)

	headerBlock := buf.Bytes()
	if len(headerBlock) == 0 {

  <mime-type type="application/xcap-ns+xml"/>
  <mime-type type="application/xcon-conference-info-diff+xml"/>
  <mime-type type="application/xcon-conference-info+xml"/>
  <mime-type type="application/xenc+xml">
    <glob pattern="*.xenc"/>
  </mime-type>

  <mime-type type="application/xhtml+xml">
    <!-- The magic priority for xhtml+xml needs to be lower than that of -->

}

// ValidateNonSpecialIP is used to validate Endpoints, EndpointSlices, and
// external IPs. Specifically, this disallows unspecified and loopback addresses
// are nonsensical and link-local addresses tend to be used for node-centric
// purposes (e.g. metadata service).
//
// IPv6 references
// - https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml