implement "byte-serializing a request origin"

[github-actions]

https://github.com/hoverkraft-tech/compose-action/blob/2ab47e7e09da3e8e47398d6c26b9bd345071a442/dist/index.js#L25988

// https://fetch.spec.whatwg.org/#append-a-request-origin-header
function appendRequestOriginHeader (request) {
  // 1. Let serializedOrigin be the result of byte-serializing a request origin
  //    with request.
  // TODO: implement "byte-serializing a request origin"
  let serializedOrigin = request.origin

  // - "'client' is changed to an origin during fetching."
  //   This doesn't happen in undici (in most cases) because undici, by default,
  //   has no concept of origin.
  // - request.origin can also be set to request.client.origin (client being
  //   an environment settings object), which is undefined without using
  //   setGlobalOrigin.
  if (serializedOrigin === 'client' || serializedOrigin === undefined) {
    return
  }

  // 2. If request’s response tainting is "cors" or request’s mode is "websocket",
  //    then append (`Origin`, serializedOrigin) to request’s header list.
  // 3. Otherwise, if request’s method is neither `GET` nor `HEAD`, then:
  if (request.responseTainting === 'cors' || request.mode === 'websocket') {
    request.headersList.append('origin', serializedOrigin, true)
  } else if (request.method !== 'GET' && request.method !== 'HEAD') {
    // 1. Switch on request’s referrer policy:
    switch (request.referrerPolicy) {

[github-actions]

This issue is stale