XHook 可轻松的修改 XHR 的请求和响应。主要用于：

• Cache requests in memory, localStorage, etc.

• Insert authentication headers

• S3 Request Signing, see S3 Hook

• Simulate responses

• Create fake transparent backends for testing purposes

• Sending Error statistics to Google Analytics

• Polyfil CORS, by offloading requests to an iframe then splicing the response back in, see XDomain

• Devious practical jokes

• Preflight GZip compression, see XZip (In progress)

示例代码：

//modify 'responseText' of 'example2.txt'  xhook.after(function(request, response) {    if(request.url.match(/example\.txt$/))       response.text = response.text.replace(/[aeiou]/g,'z');  });

支持的浏览器：IE8+, Chrome, Firefox, Safari

项目主页：http://www.open-open.com/lib/view/home/1405326930290