http2-proxy

node-http2-proxy

A simple http/2 & http/1.1 to http/1.1 spec compliant proxy helper for Node.

Features

• Proxies HTTP 2, HTTP 1 and WebSocket.
• Simple and high performance.
• Hop by hop header handling.
• Connection header handling.
• Via header handling.
• Forward header handling.

Installation

$ npm install http2-proxy

Notes

http2-proxy requires at least node v10.0.0.

Request & Response errors are emitted to the server object either as clientError for http/1 or streamError for http/2. See the NodeJS documentation for further details.

You need to use an final and/or error handler since errored responses won't be cleaned up automatically.

const finalhandler = require('finalhandler')

const defaultWebHandler = (err, req, res) => {
  if (err) {
    console.error('proxy error', err)
    finalhandler(req, res)(err)
  }
}

const defaultWSHandler = (err, req, socket, head) => {
  if (err) {
    console.error('proxy error', err)
    socket.destroy()
  }
}

HTTP/1 API

You must pass allowHTTP1: true to the http2.createServer or http2.createSecureServer factory methods.

import http2 from 'http2'
import proxy from 'http2-proxy'

const server = http2.createServer({ allowHTTP1: true })
server.listen(8000)

You can also use http-proxy2 with the old http && https API's.

import http from 'http'

const server = http.createServer()
server.listen(8000)

API

Proxy HTTP/2, HTTP/1 and WebSocket

server.on('request', (req, res) => {
  proxy.web(req, res, {
    hostname: 'localhost'
    port: 9000
  }, defaultWebHandler)
})
server.on('upgrade', (req, socket, head) => {
  proxy.ws(req, socket, head, {
    hostname: 'localhost'
    port: 9000
  }, defaultWsHandler)
})

Use Connect & Helmet

const app = connect()
app.use(helmet())
app.use((req, res, next) => proxy
  .web(req, res, {
    hostname: 'localhost'
    port: 9000
  }, err => {
    if (err) {
      next(err)
    }
  })
)
server.on('request', app)

Add x-forwarded headers

server.on('request', (req, res) => {
  proxy.web(req, res, {
    hostname: 'localhost'
    port: 9000,
    onReq: (req, { headers }) => {
      headers['x-forwarded-for'] = req.socket.remoteAddress
      headers['x-forwarded-proto'] = req.socket.encrypted ? 'https' : 'http'
      headers['x-forwarded-host'] = req.headers['host']
    }
  }, defaultWebHandler)
})

Follow Redirects

const http = require('follow-redirects').http

server.on('request', (req, res) => {
  proxy.web(req, res, {
    hostname: 'localhost'
    port: 9000,
    onReq: (req, options) => http.request(options)
  }, defaultWebHandler)
})

web (req, res, options, [callback])

• req: http.IncomingMessage or http2.Http2ServerRequest.
• res: http.ServerResponse or http2.Http2ServerResponse.
• options: See Options
• callback(err, req, res): Called on completion or error. Optional.

See request

ws (req, socket, head, options, [callback])

• req: http.IncomingMessage.
• socket: net.Socket.
• head: Buffer.
• options: See Options.
• callback(err, req, socket, head): Called on completion or error. Optional.

See upgrade

Options

• hostname: Proxy http.request(options) target hostname.
• port: Proxy http.request(options) target port.
• protocol: 'string' agent protocol ('http' or 'https'). Defaults to 'http'.
• path: 'string' target pathname. Defaults to req.originalUrl || req.url.
• proxyTimeout: Proxy http.request(options) timeout.
• proxyName: Proxy name used for Via header.
• timeout: http.IncomingMessage or http2.Http2ServerRequest timeout.
• onReq(req, options, callback): Called before proxy request. If returning a truthy value it will be used as the request.
  • req: http.IncomingMessage or http2.Http2ServerRequest
  • options: Options passed to http.request(options).
  • callback(err): Called on completion or error. Optionally a promise can be returned.
• onRes(req, resOrSocket, proxyRes, callback): Called before proxy response.
  • req: http.IncomingMessage or http2.Http2ServerRequest.
  • resOrSocket: For web http.ServerResponse or http2.Http2ServerResponse and for ws net.Socket.
  • proxyRes: http.ServerResponse.
  • callback(err): Called on completion or error. Optionally a promise can be returned.

License

MIT