node-http2-proxy

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

Features

• Proxies HTTP 2, HTTP 1.1 and WebSocket
• Simple and easy to follow implementation
• GC friendly with minimal allocations
• Hop by hop header handling
• Connection header handling
• Via header handling
• Forwarded header handling

Installation

$ npm install http2-proxy

Notes

http2-proxy requires node v8.5.0 or newer with http2 enabled. Pass the --expose-http2 option when starting node v8.x.x.

Usage

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)

Proxy HTTP 1.1/2 and WebSocket

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

Use Helmet to secure response headers

server.on('request', (req, res) => {
  proxy.web(req, res, {
    hostname: 'localhost'
    port: 9000,
    onRes: (req, res) => helmet(req, res, () => {})
  }, err => console.error('proxy error', err))
})

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']
    }
  }, err => console.error(err, 'proxy error'))
})

API

web (req, res, options, onProxyError)

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

See request

ws (req, socket, head, options, onProxyError)

• req: http.IncomingMessage.
• socket: net.Socket.
• head: Buffer.
• options: See Options.
• onProxyError(err): Called on error.

See upgrade

Options

• hostname: Proxy http.request(options) target hostname.
• port: Proxy http.request(options) target port.
• proxyTimeout: Proxy http.request(options) timeout.
• proxyName: Proxy name used for Via header.
• timeout: http.IncomingMessage or http2.Http2ServerRequest timeout
• onReq(req, options): Called before proxy request. Note you cannot keep a reference to the options object as it will be re-used by http2-proxy.
  • req: http.IncomingMessage or http2.Http2ServerRequest
  • options: Options passed to http.request(options).
• onRes(req, resOrSocket): Called before proxy response.
  • req: http.IncomingMessage or http2.Http2ServerRequest.
  • resOrSocket: For web http.ServerResponse or http2.Http2ServerResponse and for ws net.Socket.

License

MIT