Chrome扩展程序：如何拦截请求的网址？

问题描述：

如果某些条件匹配，扩展程序如何拦截任何请求的URL来阻止它？（针对Firefox的类似问题）

How can an extension intercept any requested URL to block it if some condition matches? (similar question for Firefox)

需要在manifest.json中设置什么权限？

What permission needs to be set in manifest.json?

答

JavaScript代码：

JavaScript Code :

以下示例说明了如何阻止对www.evil.com的所有请求：

The following example illustrates how to block all requests to www.evil.com:

chrome.webRequest.onBeforeRequest.addListener(
  function(details) {
    return {cancel: details.url.indexOf("://www.evil.com/") != -1};
  },
  { urls: ["<all_urls>"] },
  ["blocking"]
);

下面的示例以更有效的方式实现了相同的目标，因为未定向到www的请求。 evil.com不需要传递给扩展名：

The following example achieves the same goal in a more efficient way because requests that are not targeted to www.evil.com do not need to be passed to the extension:

chrome.webRequest.onBeforeRequest.addListener(
  function(details) { 
    return { cancel: true }; 
  },
  {urls: ["*://www.evil.com/*"]},
  ["blocking"]
);

注册事件监听器：

要为Web请求注册事件侦听器，请对通常的 addListener（）函数使用一个变体。除了指定回调函数外，还必须指定过滤器参数，还可以指定可选的额外信息参数。

To register an event listener for a web request, you use a variation on the usual addListener() function. In addition to specifying a callback function, you have to specify a filter argument and you may specify an optional extra info argument.

Web请求API的三个参数addListener（）具有以下定义：

The three arguments to the web request API's addListener() have the following definitions:

var callback = function(details) {...};
var filter = {...};
var opt_extraInfoSpec = [...];

下面是一个监听onBeforeRequest事件的示例：

Here's an example of listening for the onBeforeRequest event:

chrome.webRequest.onBeforeRequest.addListener(
  callback, filter, opt_extraInfoSpec);

manifest.json所需的权限：

"permissions": [
  "webRequest",
  "webRequestBlocking",
"tabs",
"<all_urls>"
],

扩展示例和帮助链接：

请求扩展： https://chrome.google.com/webstore/detail/requestly/mdnleldcmiljblolnjhpnblkcekpdkpa

扩展Https-Everywhere： https://github.com/EFForg/https-everywhere

示例： https://github.com/blunderboy/requestly/blob/master/src/background/background .js

Wiki： https： //code.google.com/p/html5security/wiki/RedirectionMethods

Wiki： https://developer.chrome.com/extensions/webRequest

Extension Requestly : https://chrome.google.com/webstore/detail/requestly/mdnleldcmiljblolnjhpnblkcekpdkpa
Extension Https-Everywhere : https://github.com/EFForg/https-everywhere
Example : https://github.com/blunderboy/requestly/blob/master/src/background/background.js
Wiki : https://code.google.com/p/html5security/wiki/RedirectionMethods
Wiki : https://developer.chrome.com/extensions/webRequest

Chrome扩展程序：如何拦截请求的网址？

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