如何使用node-http-proxy反向代理客户端POST和PUT请求

Question

我正在尝试使用node-http-proxy作为反向代理,但我似乎无法使POST和PUT请求起作用.文件server1.js是反向代理(至少对于具有url"/ forward-this"的请求),server2.js是接收代理请求的服务器.请解释一下我做错了什么.

这是server1.js的代码:

// File: server1.js
//

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

httpProxy.createServer(function (req, res, proxy) {
    if (req.method == 'POST' || req.method == 'PUT') {
        req.body = '';

        req.addListener('data', function(chunk) {
            req.body += chunk;
        });

        req.addListener('end', function() {
            processRequest(req, res, proxy);
        });
    } else {
        processRequest(req, res, proxy);
    }

}).listen(8080);

function processRequest(req, res, proxy) {

    if (req.url == '/forward-this') {
        console.log(req.method + ": " + req.url + "=> I'm going to forward this.");

        proxy.proxyRequest(req, res, {
            host: 'localhost',
            port: 8855
        });
    } else {
        console.log(req.method + ": " + req.url + "=> I'm handling this.");

        res.writeHead(200, { "Content-Type": "text/plain" });
        res.write("Server #1 responding to " + req.method + ": " + req.url + "\n");
        res.end();
    }
}

这是server2.js的代码:

// File: server2.js
// 

var http = require('http');

http.createServer(function (req, res, proxy) {
    if (req.method == 'POST' || req.method == 'PUT') {
        req.body = '';

        req.addListener('data', function(chunk) {
            req.body += chunk;
        });

        req.addListener('end', function() {
            processRequest(req, res);
        });
    } else {
        processRequest(req, res);
    }

}).listen(8855);

function processRequest(req, res) {
    console.log(req.method + ": " + req.url + "=> I'm handling this.");

    res.writeHead(200, { 'Content-Type': 'text/plain' });
    res.write("Server #2 responding to " + req.method + ': url=' + req.url + '\n');
    res.end();
}

Answer 1

http-proxy取决于POST/PUT请求的事件data和end事件.server1接收请求的时间与代理请求之间的延迟意味着http-proxy完全错过了这些事件.这里有两个选项可以使其正常工作 - 您可以缓冲请求,也可以使用路由代理.路由代理似乎最合适,因为您只需要代理一部分请求.这是修改后的server1.js:

// File: server1.js
//

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

http.createServer(function (req, res) {
    if (req.url == '/forward-this') {
        return proxy.proxyRequest(req, res, {
            host: 'localhost',
            port: 8855
        });
    }

    if (req.method == 'POST' || req.method == 'PUT') {
        req.body = '';

        req.addListener('data', function(chunk) {
            req.body += chunk;
        });

        req.addListener('end', function() {
            processRequest(req, res);
        });
    } else {
        processRequest(req, res);
    }

}).listen(8080);

function processRequest(req, res) {
    console.log(req.method + ": " + req.url + "=> I'm handling this.");

    res.writeHead(200, { "Content-Type": "text/plain" });
    res.write("Server #1 responding to " + req.method + ": " + req.url + "\n");
    res.end();
}