node-http-proxy README

The project's README from github.com/http-party/node-http-proxy. As one markdown file: README.md.

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node-http-proxy is an HTTP programmable proxying library that supports websockets. It is suitable for implementing components such as reverse proxies and load balancers.

Table of Contents

Installation

npm install http-proxy --save

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Upgrading from 0.8.x ?

Click here

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Core Concept

A new proxy is created by calling createProxyServer and passing an options object as argument (valid properties are available here)

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

var proxy = httpProxy.createProxyServer(options); // See (†)

†Unless listen(..) is invoked on the object, this does not create a webserver. See below.

An object will be returned with four methods:

It is then possible to proxy requests by calling these functions

http.createServer(function(req, res) {
  proxy.web(req, res, { target: 'http://mytarget.com:8080' });
});

Errors can be listened on either using the Event Emitter API

proxy.on('error', function(e) {
  ...
});

or using the callback API

proxy.web(req, res, { target: 'http://mytarget.com:8080' }, function(e) { ... });

When a request is proxied it follows two different pipelines (available here) which apply transformations to both the req and res object. The first pipeline (incoming) is responsible for the creation and manipulation of the stream that connects your client to the target. The second pipeline (outgoing) is responsible for the creation and manipulation of the stream that, from your target, returns data to the client.

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Use Cases

Setup a basic stand-alone proxy server

var http = require('http'),
    httpProxy = require('http-proxy');
//
// Create your proxy server and set the target in the options.
//
httpProxy.createProxyServer({target:'http://localhost:9000'}).listen(8000); // See (†)

//
// Create your target server
//
http.createServer(function (req, res) {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.write('request successfully proxied!' + '\n' + JSON.stringify(req.headers, true, 2));
  res.end();
}).listen(9000);

†Invoking listen(..) triggers the creation of a web server. Otherwise, just the proxy instance is created.

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Setup a stand-alone proxy server with custom server logic

This example shows how you can proxy a request using your own HTTP server and also you can put your own logic to handle the request.

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

//
// Create a proxy server with custom application logic
//
var proxy = httpProxy.createProxyServer({});

//
// Create your custom server and just call `proxy.web()` to proxy
// a web request to the target passed in the options
// also you can use `proxy.ws()` to proxy a websockets request
//
var server = http.createServer(function(req, res) {
  // You can define here your custom logic to handle the request
  // and then proxy the request.
  proxy.web(req, res, { target: 'http://127.0.0.1:5050' });
});

console.log("listening on port 5050")
server.listen(5050);

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Setup a stand-alone proxy server with proxy request header re-writing

This example shows how you can proxy a request using your own HTTP server that modifies the outgoing proxy request by adding a special header.

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

//
// Create a proxy server with custom application logic
//
var proxy = httpProxy.createProxyServer({});

// To modify the proxy connection before data is sent, you can listen
// for the 'proxyReq' event. When the event is fired, you will receive
// the following arguments:
// (http.ClientRequest proxyReq, http.IncomingMessage req,
//  http.ServerResponse res, Object options). This mechanism is useful when
// you need to modify the proxy request before the proxy connection
// is made to the target.
//
proxy.on('proxyReq', function(proxyReq, req, res, options) {
  proxyReq.setHeader('X-Special-Proxy-Header', 'foobar');
});

var server = http.createServer(function(req, res) {
  // You can define here your custom logic to handle the request
  // and then proxy the request.
  proxy.web(req, res, {
    target: 'http://127.0.0.1:5050'
  });
});

console.log("listening on port 5050")
server.listen(5050);

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Modify a response from a proxied server

Sometimes when you have received a HTML/XML document from the server of origin you would like to modify it before forwarding it on.

Harmon allows you to do this in a streaming style so as to keep the pressure on the proxy to a minimum.

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Setup a stand-alone proxy server with latency

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

//
// Create a proxy server with latency
//
var proxy = httpProxy.createProxyServer();

//
// Create your server that makes an operation that waits a while
// and then proxies the request
//
http.createServer(function (req, res) {
  // This simulates an operation that takes 500ms to execute
  setTimeout(function () {
    proxy.web(req, res, {
      target: 'http://localhost:9008'
    });
  }, 500);
}).listen(8008);

//
// Create your target server
//
http.createServer(function (req, res) {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.write('request successfully proxied to: ' + req.url + '\n' + JSON.stringify(req.headers, true, 2));
  res.end();
}).listen(9008);

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Using HTTPS

You can activate the validation of a secure SSL certificate to the target connection (avoid self-signed certs), just set secure: true in the options.

HTTPS -> HTTP
//
// Create the HTTPS proxy server in front of a HTTP server
//
httpProxy.createServer({
  target: {
    host: 'localhost',
    port: 9009
  },
  ssl: {
    key: fs.readFileSync('valid-ssl-key.pem', 'utf8'),
    cert: fs.readFileSync('valid-ssl-cert.pem', 'utf8')
  }
}).listen(8009);
HTTPS -> HTTPS
//
// Create the proxy server listening on port 443
//
httpProxy.createServer({
  ssl: {
    key: fs.readFileSync('valid-ssl-key.pem', 'utf8'),
    cert: fs.readFileSync('valid-ssl-cert.pem', 'utf8')
  },
  target: 'https://localhost:9010',
  secure: true // Depends on your needs, could be false.
}).listen(443);
HTTP -> HTTPS (using a PKCS12 client certificate)
//
// Create an HTTP proxy server with an HTTPS target
//
httpProxy.createProxyServer({
  target: {
    protocol: 'https:',
    host: 'my-domain-name',
    port: 443,
    pfx: fs.readFileSync('path/to/certificate.p12'),
    passphrase: 'password',
  },
  changeOrigin: true,
}).listen(8000);

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Proxying WebSockets

You can activate the websocket support for the proxy using ws:true in the options.

//
// Create a proxy server for websockets
//
httpProxy.createServer({
  target: 'ws://localhost:9014',
  ws: true
}).listen(8014);

Also you can proxy the websocket requests just calling the ws(req, socket, head) method.

//
// Setup our server to proxy standard HTTP requests
//
var proxy = new httpProxy.createProxyServer({
  target: {
    host: 'localhost',
    port: 9015
  }
});
var proxyServer = http.createServer(function (req, res) {
  proxy.web(req, res);
});

//
// Listen to the `upgrade` event and proxy the
// WebSocket requests as well.
//
proxyServer.on('upgrade', function (req, socket, head) {
  proxy.ws(req, socket, head);
});

proxyServer.listen(8015);

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Options

httpProxy.createProxyServer supports the following options:

NOTE: options.ws and options.ssl are optional. options.target and options.forward cannot both be missing

If you are using the proxyServer.listen method, the following options are also applicable:

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Listening for proxy events

var httpProxy = require('http-proxy');
// Error example
//
// Http Proxy Server with bad target
//
var proxy = httpProxy.createServer({
  target:'http://localhost:9005'
});

proxy.listen(8005);

//
// Listen for the `error` event on `proxy`.
proxy.on('error', function (err, req, res) {
  res.writeHead(500, {
    'Content-Type': 'text/plain'
  });

  res.end('Something went wrong. And we are reporting a custom error message.');
});

//
// Listen for the `proxyRes` event on `proxy`.
//
proxy.on('proxyRes', function (proxyRes, req, res) {
  console.log('RAW Response from the target', JSON.stringify(proxyRes.headers, true, 2));
});

//
// Listen for the `open` event on `proxy`.
//
proxy.on('open', function (proxySocket) {
  // listen for messages coming FROM the target here
  proxySocket.on('data', hybiParseAndLogMessage);
});

//
// Listen for the `close` event on `proxy`.
//
proxy.on('close', function (res, socket, head) {
  // view disconnected websocket connections
  console.log('Client disconnected');
});

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Shutdown

var proxy = new httpProxy.createProxyServer({
  target: {
    host: 'localhost',
    port: 1337
  }
});

proxy.close();

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Miscellaneous

If you want to handle your own response after receiving the proxyRes, you can do so with selfHandleResponse. As you can see below, if you use this option, you are able to intercept and read the proxyRes but you must also make sure to reply to the res itself otherwise the original client will never receive any data.

Modify response


    var option = {
      target: target,
      selfHandleResponse : true
    };
    proxy.on('proxyRes', function (proxyRes, req, res) {
        var body = [];
        proxyRes.on('data', function (chunk) {
            body.push(chunk);
        });
        proxyRes.on('end', function () {
            body = Buffer.concat(body).toString();
            console.log("res from proxied server:", body);
            res.end("my response to cli");
        });
    });
    proxy.web(req, res, option);

ProxyTable API

A proxy table API is available through this add-on module, which lets you define a set of rules to translate matching routes to target routes that the reverse proxy will talk to.

Test

$ npm test

Logo created by Diego Pasquali

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Contributing and Issues

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License

The MIT License (MIT)

Copyright (c) 2010 - 2016 Charlie Robbins, Jarrett Cruger & the Contributors.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

node-http-proxy (http-party/node-http-proxy)

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14.1K ·GitHub
Node-http-proxy
这是什么？node-http-proxy 是一个可编程的 HTTP 代理库，适用于 Node.js，同时支持 WebSocket，可用于构建反向代理、负载均衡器等。
这是独立的代理服务器，还是我可以嵌入自己代码里的库？它是一个库：调用 createProxyServer() 即可获得一个代理对象，该对象提供 web/ws/listen/close 方法。然后你可以调用 listen() 启动独立服务器，也可以将它接入你自己的 HTTP 服务器逻辑中。
我该怎么把它加到项目里？通过 npm 安装：`npm install http-proxy --save`，然后引入它，并使用你的目标配置调用 httpProxy.createProxyServer({...})。
运行它还需要额外的依赖吗？它只需要 Node.js 8.0.0 或更高版本；它自身的运行时依赖（eventemitter3、requires-port、follow-redirects）会通过 npm 自动安装。
它会自动处理客户端和目标之间的错误吗？不会。该库不会对客户端与代理之间、或代理与目标之间传递的消息做任何错误处理，因此你需要自己监听 'error' 事件并处理失败情况。
谁会用这个？需要在 Node.js 上构建反向代理、负载均衡器，或在其他 HTTP 或 WebSocket 服务器前实现自定义请求路由或重写逻辑的开发者。
它能代理 HTTPS 并校验 SSL 证书吗？可以。你可以代理到 HTTPS 目标服务器，或从 HTTPS 目标服务器进行代理，并设置 `secure: true` 来校验目标的 SSL 证书，从而避免使用自签名证书。
我该怎么代理 WebSocket 流量？在代理选项中设置 `ws: true`，或直接调用 ws(req, socket, head) 方法来处理传入的 WebSocket 升级请求。
我能通过代理重写请求头、Cookie 或重定向地址吗？可以。changeOrigin、cookieDomainRewrite、cookiePathRewrite、hostRewrite、autoRewrite 和 protocolRewrite 等选项可以让你实时重写请求头、set-cookie 的域名和路径以及重定向地址。
我能在响应返回客户端之前修改响应正文吗？可以。使用 selfHandleResponse 选项并结合 proxyRes 事件，你就能自行拦截和修改响应（或使用单独的 Harmon 模块进行流式 HTML/XML 转换）。
What are similar projects?pingora, http-proxy-middleware, nginx, traefik, socket.io, ws, axios, request
Which topics is it in?load-balancer, reverse-proxy, websocket, http, proxy, backend, networking, npm, api, server, nodejs, library
Creator
http-party
Size
1.7 MB
Stars
14.1K
Updated
CommitMay 17Release1.17.0Apr 20
Age
16y
Commits · 90 Days