fast-proxy-lite

Node.js framework agnostic library that enables you to forward an http request to another HTTP server. Supported proxy protocols: HTTP, HTTPS

This library was initially forked from fast-proxy: https://github.com/fastify/fast-proxy

fast-proxy-lite powers: https://www.npmjs.com/package/fast-gateway 🚀

Install

npm i fast-proxy-lite

Usage

The following examples describe how to use fast-proxy-lite with restana:

Gateway:

const { proxy, close } = require('fast-proxy-lite')({
  base: 'http://127.0.0.1:3000'
  // options
})
const gateway = require('restana')()

gateway.all('/service/*', function (req, res) {
  proxy(req, res, req.url, {})
})

gateway.start(8080)

Remote service:

const service = require('restana')()
service.get('/service/hi', (req, res) => res.send('Hello World!'))

service.start(3000)

Using imports:

import fastProxy from 'fast-proxy-lite'

const { proxy, close } = fastProxy({
  base: 'http://127.0.0.1:3000'
})

Benchmarks

Please see: https://github.com/jkyberneees/nodejs-proxy-benchmarks

API

Options

base

Set the base URL for all the forwarded requests.

cacheURLs

The number of parsed URLs that will be cached. Default: 100.

Use value = 0 to disable the caching mechanism

requests.http and requests.https

Allows to optionally overwrite the internal http and https client agents implementation. Defaults: http and https.

For example, this could be used to add support for following redirects, like so:

...
  requests: {
    http: require('follow-redirects/http'),
    https: require('follow-redirects/https')
  }
...

keepAliveMsecs

Defaults to 1 minute, passed down to [http.Agent][http-agent] and [https.Agent][https-agent] instances.

maxSockets

Defaults to 2048 sockets, passed down to [http.Agent][http-agent] and [https.Agent][https-agent] instances.

rejectUnauthorized

Defaults to true, passed down to [https.Agent][https-agent] instances. This needs to be set to false to reply from https servers with self-signed certificates.

Extended configurations

Other supported configurations in https://nodejs.org/api/http.html#http_new_agent_options can also be part of the opts object.

close

Optional "on close resource release" strategy. You can link this to your application shutdown hook as an example.

proxy(originReq, originRes, source, [opts])

Enables you to forward an http request to another HTTP server.

proxy(
  originReq,                          // http.IncomingMessage 
  originRes,                          // http.ServerResponse
  req.url,                            // String -> remote URL + path or path if base was set
  {}                                  // Options described below
)

opts

base

Optionally indicates the base URL for the current request proxy. When used, the global base config is overwriten.

onResponse(req, res, stream)

Called when an http response is received from the source. The default behavior is pump(stream, res), which will be disabled if the option is specified.

onClientConnectionTerminated(res, err, response)

Called when the client HTTP connection to the proxy server unexpectedly terminates before the downstream service response is sent.

// internal implementation
if (!res.socket || res.socket.destroyed || res.writableEnded) {
  return onClientConnectionTerminated(res, err, response)
}

rewriteRequestHeaders(req, headers)

Called to rewrite the headers of the request, before them being sent to the downstream server. It must return the new headers object.

rewriteHeaders(headers)

Called to rewrite the headers of the response, before them being copied over to the outer response. It must return the new headers object.

request

Extended options supported by http[s].request method (https://nodejs.org/api/http.html#http_http_request_options_callback)

The following options are dynamically assigned: method, port, path, hostname, headers, agent.

queryString

Replaces the original querystring of the request with what is specified.

Related topics

• http-agent: https://nodejs.org/api/http.html#http_new_agent_options
• https-agent: https://nodejs.org/api/https.html#https_class_https_agent

License

MIT