Http Proxy

An Alternative to HTTP Proxy

Description

This is meant as a project to convert node-http-proxy/http-proxy to typescript. While also incorporating some of the pull requests that were left unanswered/uncomitted that were useful.

Development

Running tests for development:

$ npm install
$ npm run build
$ npm run test

Options

ProxySever | createProxyServer | createServer | createProxy supports the following options:

• target: string - url string to be parsed with the url module

• forward: string - url string to be parsed with the url module

• agent: object - object to be passed to http(s).request (see Node's https agent and http agent objects)

• ssl: object - object to be passed to https.createServer()

• ws: boolean- if you want to proxy websockets

• xfwd: boolean - adds x-forward headers

• secure: boolean - if you want to verify the SSL Certs

• toProxy: boolean - passes the absolute URL as the path (useful for proxying to proxies)

• prependPath: boolean - Default: true - specify whether you want to prepend the target's path to the proxy path

• ignorePath: boolean - Default: false - specify whether you want to ignore the proxy path of the incoming request (note: you will have to append / manually if required).

• localAddress: string Local interface string to bind for outgoing connections

• changeOrigin: boolean - Default: false - changes the origin of the host header to the target URL | deprecated

• changeHost: boolean - Default: false - changes the origin of the host header to the target URL

• preserveHeaderKeyCase: boolean - Default: false - specify whether you want to keep letter case of response header key

• auth: string - Basic authentication i.e. 'user:password' to compute an Authorization header.

• hostRewrite: string - rewrites the location hostname on (201/301/302/303/307/308) redirects.

• autoRewrite: boolean - rewrites the location host/port on (201/301/302/303/307/308) redirects based on requested host/port. Default: false.

• protocolRewrite: http|https|null - rewrites the location protocol on (201/301/302/307/308) redirects to 'http' or 'https'.

• cookieDomainRewrite: false|string|object - rewrites domain of set-cookie headers. Possible values:

  • false (default): disable cookie rewriting
  • string: new domain, for example cookieDomainRewrite: "new.domain". To remove the domain, use cookieDomainRewrite: "".
  • object: mapping of domains to new domains, use "*" to match all domains. For example keep one domain unchanged, rewrite one domain and remove other domains:

  cookieDomainRewrite: {
      "unchanged.domain": "unchanged.domain",
      "old.domain": "new.domain",
      "*": ""
  }

• cookiePathRewrite: false|string|object - rewrites path of set-cookie headers. Possible values:

  • false (default): disable cookie rewriting
  • string: new path, for example cookiePathRewrite: "/newPath/". To remove the path, use cookiePathRewrite: "". To set path to root use cookiePathRewrite: "/".
  • object: mapping of paths to new paths, use "*" to match all paths. For example, to keep one path unchanged, rewrite one path and remove other paths:

  cookiePathRewrite: {
      "/unchanged.path/": "/unchanged.path/",
      "/old.path/": "/new.path/",
      "*": ""
  }

• cookieRemoveSecure: boolean - specify if you want to remove the secure flag from the cookie

• mergeCookies: boolean - allows to merge set-cookie headers from passed response and response from target. Default: false.

• headers: object - object with extra headers to be added to target requests.

• outgoingHeaders: object - object with extra headers to be added to proxy requests.

• proxyTimeout: number - timeout (in millis) for outgoing proxy requests

• proxyTimeoutCustomError: boolean - specify whether you want to throw a custom ETIMEDOUT error when the proxyTimeout is reached. If false then the default ECONNRESET error will be thrown. Default: false.

• timeout: number - timeout (in millis) for incoming requests

• followRedirects: boolean - Default: false - specify whether you want to follow redirects

• forcePasses: boolean - if set to true the web passes will be run even if selfHandleResponse is also set to true. (Default: false)

• selfHandleResponse: boolean - if set to true, none of the webOutgoing passes are called and it's your responsibility to appropriately return the response by listening and acting on the proxyRes event

• createWsClientTransformStream: function|null - if set, this function will be called with three arguments req, proxyReq and proxyRes and should return a Duplex stream, data from the client websocket will be piped through this stream before being piped to the server, allowing you to influence the request data.

• createWsServerTransformStream: function|null - if set, this function will be called with three arguments req, proxyReq and proxyRes and should return a Duplex stream, data from the server websocket will be piped through this stream before being piped to the client, allowing you to influence the response data.

• buffer: Buffer - stream of data to send as the request body. Maybe you have some middleware that consumes the request stream before proxying it on e.g. If you read the body of a request into a field called 'req.rawbody' you could restream this field in the buffer option:

  import streamify from 'stream-array'
  import { ProxyServer } from '@refactorjs/http-proxy'
  const proxy = new ProxyServer();
  
  export function (req, res, next) {
      proxy.web(req, res, {
          target: 'http://localhost:4003/',
          buffer: streamify(req.rawBody)
      }, next);
  }

• lookup: undefined|function define a custom dns lookup function to use when resolving target/forward hostnames.

  // Example: add dns caching
  import dlc from 'dns-lookup-cache'
  import { ProxyServer } from '@refactorjs/http-proxy'
  const proxy = new ProxyServer();
  
  export function (req, res, next) {
      proxy.web(req, res, {
          target: 'http://example.com',
          lookup: dlc.lookup,
      }, next);
  }

NOTE:

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

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

• ssl: object - object to be passed to https.createServer()
• ws: boolean - if you want to proxy websockets