如何拦截包括表单提交在内的所有http请求 [英] How to intercept all http requests including form submits

问题描述

我想拦截从我的网页发出的所有 http 请求，并向请求正文添加一个参数.我的页面包含表单 - 我还想捕获表单提交.我曾尝试使用 Jquery ajaxSend 和 Javascript 的 setRequestHeader，但两者都不适合我.我如何实现这一目标?

I would like to intercept all http requests going out from my web page and add a parameter to the request body. My page includes forms - I also want to capture form submits. I have tried using Jquery ajaxSend and Javascript's setRequestHeader but both did not work for me. How do I achieve this?

谢谢

推荐答案

https://developer.mozilla.org/en/docs/Web/API/Service_Worker_API

Service Worker 本质上充当位于 Web 应用程序、浏览器和网络(如果可用)之间的代理服务器.

Service workers essentially act as proxy servers that sit between web applications, and the browser and network (when available).

它采用JavaScript文件的形式，可以控制与其关联的网页/站点，拦截和修改导航和资源请求

It takes the form of a JavaScript file that can control the web page/site it is associated with, intercepting and modifying navigation and resource requests

您在应用程序代码中从名为 sw.js 的文件注册一个 Service Worker，方法如下:

You register a service worker in your application code from a file named, e.g., sw.js by doing:

if ('serviceWorker' in navigator) {
  window.addEventListener('load', function() {
    navigator.serviceWorker.register('sw.js').then(function(registration) {
      console.log('Service worker registered with scope: ', registration.scope);
    }, function(err) {
      console.log('ServiceWorker registration failed: ', err);
    });
  });
}

在 sw.js 文件(实际的 service-worker 代码)中:为了拦截请求，你将一个 fetch 事件监听器附加到调用respondWith() 方法并对事件对象中的 .request 成员执行某些操作:

And in the sw.js file (the actual service-worker code): To intercept requests, you attach a fetch event listener to the service worker that calls the respondWith() method and does something with the .request member from the event object:

self.addEventListener('fetch', function(event) {
  event.respondWith(
    // intercept requests by handling event.request here
  );
});

一个简单的 Service Worker 如下所示:

A simple service worker that just passes through requests unchanged looks like this:

self.addEventListener('fetch', function(event) {
  event.respondWith(
    fetch(event.request)
  );
});

要在请求正文中添加参数，您需要:

To add a param to the request body, you need to:

1. 序列化请求.
2. 修改该序列化请求.
3. 反序列化修改后的请求以创建新请求.
4. 使用该新请求调用 fetch(...).

因此，一个完成所有这些工作的 Service Worker 看起来像这样(未经测试):

So, a service worker that does all that would look like this (untested):

self.addEventListener('fetch', function(event) {
  event.respondWith(
    fetchWithParamAddedToRequestBody(event.request)
  );
});
function fetchWithParamAddedToRequestBody(request) {
  serialize(request).then(function(serialized) {
    // modify serialized.body here to add your request parameter
    deserialize(serialized).then(function(request) {
      return fetch(request);
    });
  }); // fixed this
}
function serialize(request) {
  var headers = {};
  for (var entry of request.headers.entries()) {
    headers[entry[0]] = entry[1];
  }
  var serialized = {
    url: request.url,
    headers: headers,
    method: request.method,
    mode: request.mode,
    credentials: request.credentials,
    cache: request.cache,
    redirect: request.redirect,
    referrer: request.referrer
  };  
  if (request.method !== 'GET' && request.method !== 'HEAD') {
    return request.clone().text().then(function(body) {
      serialized.body = body;
      return Promise.resolve(serialized);
    });
  }
  return Promise.resolve(serialized);
}
function deserialize(data) {
  return Promise.resolve(new Request(data.url, data));
}

注意: https://serviceworke.rs/request-deferrer_service-worker_doc.html，Service Worker Cookbook 中的一个页面，是我在其中提取serialize(...) 代码/方法来自——通过 https://stackoverflow.com/questions/35420980/how-to-alter-the-headers-of-a-request/35421644#35421644—和 值得一看，因为那里的代码有详细的注释，解释了它在做什么

Note: https://serviceworke.rs/request-deferrer_service-worker_doc.html, a page from the Service Worker Cookbook, is where I lifted that serialize(…) code/approach from—by way of the answer at https://stackoverflow.com/questions/35420980/how-to-alter-the-headers-of-a-request/35421644#35421644—and it’s worth taking a look at, because the code there has detailed annotations explaining what it’s all doing

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