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如何解決 service_worker_en.js:3 Uncaught (in promise) TypeError: Failed to execute 'workerGlobalScope'?

[英]how to solve service_worker_en.js:3 Uncaught (in promise) TypeError: Failed to execute 'fetch' on 'WorkerGlobalScope'?

我的 Chrome 控制台在我的網站上出現此錯誤

service_worker_en.js:3 Uncaught (in promise) TypeError: Failed to execute 'fetch' on 'WorkerGlobalScope': Cannot construct a Request with a Request object that has already been used.

我已經閱讀了這篇關於 SO的文章,但仍然無法弄清楚我的代碼到底出了什么問題。 這是我的服務人員代碼

self.addEventListener("install", function(event) {
    event.waitUntil(preLoad());
});
var preLoad = function() {
    console.log("Installing web app");
    return caches.open("offline").then(function(cache) {
        console.log("caching index and important routes");
        return cache.addAll(["/", "/devotional-language-en-tab-9"]);
    });
};
self.addEventListener("fetch", function(event) {
    event.respondWith(checkResponse(event.request).catch(function() {
        return returnFromCache(event.request);
    }));
    event.waitUntil(addToCache(event.request));
});
var checkResponse = function(request) {
    return new Promise(function(fulfill, reject) {
        fetch(request).then(function(response) {
            if (response.status !== 404) {
                fulfill(response);
            } else {
                reject();
            }
        }, reject);
    });
};
var addToCache = function(request) {
    return caches.open("offline").then(function(cache) {
        return fetch(request).then(function(response) {
            console.log(response.url + " was cached");
            return cache.put(request, response);
        });
    });
};
var returnFromCache = function(request) {
    return caches.open("offline").then(function(cache) {
        return cache.match(request).then(function(matching) {
            if (!matching || matching.status == 404) {
                return cache.match("offline_en.html");
            } else {
                return matching;
            }
        });
    });
};

根據 Chrome 的說法,錯誤主要在這兩行:

在此處輸入圖像描述

如何解決 service_worker_en.js:3 Uncaught (in promise) TypeError: ? 請我需要一個具體的答案來解決這個問題。

您需要在使用API_ENDPOINT.clone()獲取之前克隆請求 object,因為 object 已被使用。

var addToCache = function(request) {
  return caches.open("offline").then(function(cache) {
    return fetch(request.clone()).then(function(response) {
      console.log(response.url + " was cached");
      return cache.put(request, response);
    });
  });
};
...

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