通过 nodejs 上的代理的 TCP 套接字客户端

Question

我需要建立到 smtp 服务器的 tcp 套接字连接。是否可以通过nodejs上的代理服务器进行连接？是否有任何可用的 npm 模块？我根本找不到。

var net = require('net');

var HOST = '127.0.0.1';
var PORT = 6969;

var client = new net.Socket();
client.connect(PORT, HOST, function() {
    console.log('CONNECTED TO: ' + HOST + ':' + PORT);
    client.write('I am here!');
});

// Add a 'data' event handler for the client socket
// data is what the server sent to this socket
client.on('data', function(data) {

    console.log('DATA: ' + data);

});

// Add a 'close' event handler for the client socket
client.on('close', function() {
    console.log('Connection closed');
});

Answer 1

是的，可以使用以下 NPM 模块之一：

http-proxy-agent：HTTP 端点的 HTTP(s) 代理 http.Agent 实现

https-proxy-agent：HTTPS 端点的 HTTP(s) 代理 http.Agent 实现

pac-proxy-agent：用于 HTTP 和 HTTPS 的 PAC 文件代理 http.Agent 实现

ocks-proxy-agent：HTTP 和 HTTPS 的 SOCKS (v4a) 代理 http.Agent 实现

HTTPS 代理示例：

var url = require('url');
var WebSocket = require('ws');
var HttpsProxyAgent = require('https-proxy-agent');

// HTTP/HTTPS proxy to connect to
var proxy = process.env.http_proxy || 'http://168.63.76.32:3128';
console.log('using proxy server %j', proxy);

// WebSocket endpoint for the proxy to connect to
var endpoint = process.argv[2] || 'ws://echo.websocket.org';
var parsed = url.parse(endpoint);
console.log('attempting to connect to WebSocket %j', endpoint);

// create an instance of the `HttpsProxyAgent` class with the proxy server information
var opts = url.parse(proxy);

var agent = new HttpsProxyAgent(opts);

// finally, initiate the WebSocket connection
var socket = new WebSocket(endpoint, { agent: agent });

socket.on('open', function () {
  console.log('"open" event!');
  socket.send('hello world');
});

socket.on('message', function (data, flags) {
  console.log('"message" event! %j %j', data, flags);
  socket.close();
});

我希望这有帮助。