anyproxy-修改返回内容(beforeSendResponse)

Posted 2021-12-29 dreamhighqiu

前言

fiddler可以抓包打断点后，修改返回的内容，便于模拟各种返回结果。anyproxy也可以通过写rule模块规则，模拟返回状态码、头部、body

beforeSendResponse

beforeSendResponse(requestDetail, responseDetail)

• AnyProxy向客户端发送请求前，会调用beforeSendResponse，并带上参数requestDetail responseDetail
• requestDetail 同beforeSendRequest中的参数
• responseDetail
  response object 服务端的返回信息，包括statusCode header body三个字段
  _res object 原始的服务端返回对象

举例，请求 http://httpbin.org/get 时，responseDetail参数内容大致如下

  response: 
    statusCode: 200,
    header: 
      ‘Content-Type‘: ‘image/gif‘,
      Connection: ‘close‘,
      ‘Cache-Control‘: ‘...‘
    ,
    body: ‘...‘
  ,
  _res:  /* ... */ 

修改返回内容

以下几种返回都是合法的

不做任何处理，返回null

return null;

修改返回的状态码

var newResponse = Object.assign(, responseDetail.response);
newResponse.statusCode = 404;
return 
  response: newResponse
;

修改返回的内容

var newResponse = Object.assign(, responseDetail.response);
newResponse.body += ‘--from anyproxy--‘;
return 
  response: newResponse
;

rule案例

这里提供一些样例，来讲解规则模块的常见用法
你可以通过 anyproxy --rule http://....js 来加载模块并体验

用curl发请求测试的方法如下

• 直接请求服务器：curl http://httpbin.org/
• 通过代理服务器请求：curl http://httpbin.org/ --proxy http://127.0.0.1:8001

返回本地json格式body

使用本地数据，拦截发送到 http://httpbin.org 的请求，使用本地数据代替服务端返回，sample_use_local_response.js规则

/* 
  sample: 
    intercept all requests toward httpbin.org, use a local response
  test:
    curl http://httpbin.org/user-agent --proxy http://127.0.0.1:8001
*/
module.exports = 
  *beforeSendRequest(requestDetail) 
    const localResponse = 
      statusCode: 200,
      header:  ‘Content-Type‘: ‘application/json‘ ,
      body: ‘"hello": "this is local response"‘
    ;
    if (requestDetail.url.indexOf(‘http://httpbin.org‘) === 0) 
      return 
        response: localResponse
      ;
    
  ,
;

加载rule规则的js文件

anyproxy -i --rule sample_use_local_response.js

使用curl测试http://httpbin.org

C:\\Users\\dell>curl http://httpbin.org/user-agent --proxy http://127.0.0.1:8001
"hello": "this is local response"

模拟返回状态码

模拟返回404状态码,sample_modify_response_statuscode.js规则如下

/* 
  sample: 
    modify all status code of http://httpbin.org/ to 404
  test:
    curl -I ‘http://httpbin.org/user-agent‘ --proxy http://127.0.0.1:8001
  expected response:
    HTTP/1.1 404 Not Found
*/
module.exports = 
  *beforeSendResponse(requestDetail, responseDetail) 
    if (requestDetail.url.indexOf(‘http://httpbin.org‘) === 0) 
      const newResponse = responseDetail.response;
      newResponse.statusCode = 404;
      return 
        response: newResponse
      ;
    
  
;

模拟返回头部

修改返回的头部，sample_modify_response_header.js规则如下

/* 
  sample: 
    modify response header of http://httpbin.org/user-agent
  test:
    curl -I ‘http://httpbin.org/user-agent‘ --proxy http://127.0.0.1:8001
  expected response:
    X-Proxy-By: AnyProxy
*/
module.exports = 
  *beforeSendResponse(requestDetail, responseDetail) 
    if (requestDetail.url.indexOf(‘http://httpbin.org/user-agent‘) === 0) 
      const newResponse = responseDetail.response;
      newResponse.header[‘X-Proxy-By‘] = ‘AnyProxy‘;
      return 
        response: newResponse
      ;
    
  
;

修改返回body

修改返回的body里面部分内容，sample_modify_response_data.js规则如下

/* 
  sample: 
    modify response data of http://httpbin.org/user-agent
  test:
    curl ‘http://httpbin.org/user-agent‘ --proxy http://127.0.0.1:8001
  expected response:
     "user-agent": "curl/7.43.0"  -- AnyProxy Hacked! --
*/

module.exports = 
  *beforeSendResponse(requestDetail, responseDetail) 
    if (requestDetail.url === ‘http://httpbin.org/user-agent‘) 
      const newResponse = responseDetail.response;
      newResponse.body += ‘-- AnyProxy Hacked! --‘;
      return new Promise((resolve, reject) => 
        setTimeout(() =>  // delay the response for 5s
          resolve( response: newResponse );
        , 5000);
      );
    
  ,
;

更多学习资料参考https://github.com/alibaba/anyproxy/blob/master/docs/cn/src_doc.md

 

 

 转自：https://www.cnblogs.com/yoyoketang/p/10878193.html