javascript-如何获取由node-http-proxy完成的每个代理请求的响应时间？

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我想计算由node-http-proxy完成的每个代理请求的响应时间,如下所示：

var httpProxy = require('http-proxy');
var proxy = httpProxy.createProxyServer();

require('http').createServer(function(req, res) {
   // start-time for one request
   proxy.web(req, res, { target: 'localhost:80' });
}).listen(3000);

proxy.on('proxyRes', function (res) {
  // end-time for one request to calculate the time
  console.log('RAW Response from the target', JSON.stringify(res.headers, true, 2));
});

所以我想获得开始时间和进入时间之间的时差.我能够捕获proxyRes事件,但是如何使代理响应与正确的客户端请求匹配？

更新：我尝试了以下操作：

var httpProxy = require('http-proxy');
var http = require('http');

var proxy = new httpProxy.createProxyServer({
    target: {
        host: 'localhost',
        port: 80
    }
});

var start_time = 0;
var proxyServer = http.createServer(function (req, res) {


    start_time = new Date().getTime();

    proxy.web(req, res);

    res.on('finish', function() {
        console.log("The request was proxied in " + (new Date().getTime() - start_time) + "ms");
    });
});

proxyServer.listen(3000);

// Proxy-Target server
var n = 0; sleep = 0;
http.createServer(function (req, res) {

    n++;

    var start_time = new Date().getTime();

    res.writeHead(200, {'Content-Type': 'text/plain'});

    if (n % 2 == 0){
        sleep = 2000;
    } else {
        sleep = 5000;
    }

    setTimeout(function(){
        res.end("...");
    }, sleep);

    res.on('finish', function(d) {
        var diff_time = new Date().getTime() - start_time;
        console.log("The request was processed in " + (new Date().getTime() - start_time) + "ms");
    });

}).listen(80);

因此,正确测量了目标服务器的时间,导致一个请求可能持续2到5秒,但是代理有时测量的响应时间仅为几毫秒.
我通过使用apache-bench来尝试它,例如：ab -n 10 -c 3 http：// localhost：3000 /和控制台的结果：

The request was processed in 2007ms
The request was proxied in 2017ms
The request was processed in 2003ms
The request was proxied in 2006ms
The request was processed in 5002ms
The request was processed in 5001ms
The request was proxied in 980ms
The request was proxied in 981ms
The request was processed in 2002ms
The request was proxied in 2006ms
The request was processed in 2002ms
The request was proxied in 2005ms
The request was processed in 5000ms
The request was proxied in 8ms
The request was processed in 5000ms
The request was proxied in 982ms
The request was processed in 2001ms
The request was proxied in 2005ms
The request was processed in 5002ms
The request was proxied in 4998ms

解决方法:

现在它可以工作了,在nodejs google-gloup上得到了关键提示,start_time的对应项未在本地设置,因此这是工作代码：

var httpProxy = require('http-proxy');
var http = require('http');

var proxy = new httpProxy.createProxyServer({});

// before: var start_time = 0;
var proxyServer = http.createServer(function (req, res) {

    // now
    var start_time = new Date().getTime();

    proxy.web(req, res, { target: 'http://localhost:80' });

    res.on('finish', function() {
       console.log("The request was proxied in " + (new Date().getTime() - start_time) + "ms");
    });
});
proxyServer.listen(3000);

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