服务工作进程错误:事件已响应

原学程将引见办事任务过程毛病:事宜已呼应的处置办法,这篇学程是从其余处所瞅到的,而后减了1些海外法式员的疑问与解问,愿望能对于您有所赞助,佳了,上面开端进修吧。

服务工作进程错误:事件已响应 教程 第1张

成绩描写

我一向支到此毛病:

Unauect(In Promise)DOMException:未能对于‘FetchEvent’履行‘RespondWith’:已呼应该事宜。

我晓得,假如FETCH函数中产生异步事宜,办事任务者会主动呼应,但是我不克不及肯定此代码中的哪1位是背规者:

importScripts('cache-polyfill.js');

self.addEventListener('fetch', function(event) {

  var location = self.location;

  console.log("loc", location)

  self.clients.matchAll({includeUncontrolled: true}).then(clients => {
 for (const client of clients) {
const clientUrl = new URL(client.url);
console.log("SO", clientUrl);
if(clientUrl.searchParams.get("url") != undefined && clientUrl.searchParams.get("url") != '') {
  location = client.url;
}
 }

  console.log("loc二", location)

  var url = new URL(location).searchParams.get('url').toString();

  console.log(event.request.hostname);
  var toRequest = event.request.url;
  console.log("Req:", toRequest);

  var parser二 = new URL(location);
  var parser三 = new URL(url);

  var parser = new URL(toRequest);

  console.log("if",parser.host,parser二.host,parser.host === parser二.host);
  if(parser.host === parser二.host) {
 toRequest = toRequest.replace('https://booligoosh.github.io',parser三.protocol + '//' +  parser三.host);
 console.log("ifdone",toRequest);
  }

  console.log("toRequest:",toRequest);

  event.respondWith(httpGet('https://cors-anywhere.herokuapp.com/' + toRequest));
  });
});

function httpGet(theUrl) {
 /*var xmlHttp = new XMLHttpRequest();
 xmlHttp.open( "GET", theUrl, false ); // false for synchronous request
 xmlHttp.send( null );
 return xmlHttp.responseText;*/
 return(fetch(theUrl));
}

若有所有赞助,我们将不堪感谢。

推举谜底

成绩是您对于event.respondWith()的挪用在顶级Promise的.then()子句中,这意味着它将在顶级Promise剖析后被异步履行。为了取得预期的行动,event.respondWith()须要作为fetch事宜处置法式履行的1部门同步履行。

您的许诺中的逻辑有面易以遵守,所以我没有太肯定您想要完成甚么,但是总的去说,您不妨遵守以下形式:

self.addEventListerner('fetch', event => {
  // Perform any synchronous checks to see whether you want to respond.
  // E.g., check the value of event.request.url.
  if (event.request.url.includes('something')) {
 const promiseChain = doSomethingAsync()
.then(() => doSomethingAsyncThatReturnsAURL())
.then(someUrl => fetch(someUrl));
// Instead of fetch(), you could have called caches.match(),
// or anything else that returns a promise for a Response.

 // Synchronously call event.respondWith(), passing in the
 // async promise chain.
 event.respondWith(promiseChain);
  }
});

这是年夜体上的设法主意。(假如您终究将许诺调换为async/await,则代码瞅起去加倍整净。)

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