nesto-http-proxy-middleware
Advanced tools
The one-liner node.js proxy middleware for connect, express and browser-sync
Node.js proxying made simple. Configure proxy middleware with ease for connect, express, browser-sync and many more.
Powered by the popular Nodejitsu http-proxy. 
Proxy /api requests to http://www.example.org
var express = require('express');
var proxy = require('http-proxy-middleware');
var app = express();
app.use('/api', proxy({target: 'http://www.example.org', changeOrigin: true}));
app.listen(3000);
// http://localhost:3000/api/foo/bar -> http://www.example.org/api/foo/bar
All http-proxy options can be used, along with some extra http-proxy-middleware options.
:bulb: Tip: Set the option changeOrigin to true for name-based virtual hosted sites.
$ npm install --save-dev http-proxy-middleware
Proxy middleware configuration.
var proxy = require('http-proxy-middleware');
var apiProxy = proxy('/api', {target: 'http://www.example.org'});
// \____/ \_____________________________/
// | |
// context options
// 'apiProxy' is now ready to be used as middleware in a server.
(full list of http-proxy-middleware configuration options)
// shorthand syntax for the example above:
var apiProxy = proxy('http://www.example.org/api');
More about the shorthand configuration.
An example with express server.
// include dependencies
var express = require('express');
var proxy = require('http-proxy-middleware');
// proxy middleware options
var options = {
target: 'http://www.example.org', // target host
changeOrigin: true, // needed for virtual hosted sites
ws: true, // proxy websockets
pathRewrite: {
'^/api/old-path' : '/api/new-path', // rewrite path
'^/api/remove/path' : '/path' // remove base path
},
router: {
// when request.headers.host == 'dev.localhost:3000',
// override target 'http://www.example.org' to 'http://localhost:8000'
'dev.localhost:3000' : 'http://localhost:8000'
}
};
// create the proxy (without context)
var exampleProxy = proxy(options);
// mount `exampleProxy` in web server
var app = express();
app.use('/api', exampleProxy);
app.listen(3000);
Providing an alternative way to decide which requests should be proxied; In case you are not able to use the server's path parameter to mount the proxy or when you need more flexibility.
RFC 3986 path is used for context matching.
foo://example.com:8042/over/there?name=ferret#nose
\_/ \______________/\_________/ \_________/ \__/
| | | | |
scheme authority path query fragment
path matching
proxy({...}) - matches any path, all requests will be proxied.proxy('/', {...}) - matches any path, all requests will be proxied.proxy('/api', {...}) - matches paths starting with /apimultiple path matching
proxy(['/api', '/ajax', '/someotherpath'], {...})wildcard path matching
For fine-grained control you can use wildcard matching. Glob pattern matching is done by micromatch. Visit micromatch or glob for more globbing examples.
proxy('**', {...}) matches any path, all requests will be proxied.proxy('**/*.html', {...}) matches any path which ends with .htmlproxy('/*.html', {...}) matches paths directly under path-absoluteproxy('/api/**/*.html', {...}) matches requests ending with .html in the path of /apiproxy(['/api/**', '/ajax/**'], {...}) combine multiple patternsproxy(['/api/**', '!**/bad.json'], {...}) exclusioncustom matching
For full control you can provide a custom function to determine which requests should be proxied or not.
/**
* @return {Boolean}
*/
var filter = function (pathname, req) {
return (pathname.match('^/api') && req.method === 'GET');
};
var apiProxy = proxy(filter, {target: 'http://www.example.org'})
option.pathRewrite: object/function, rewrite target's url path. Object-keys will be used as RegExp to match paths.
// rewrite path
pathRewrite: {'^/old/api' : '/new/api'}
// remove path
pathRewrite: {'^/remove/api' : ''}
// add base path
pathRewrite: {'^/' : '/basepath/'}
// custom rewriting
pathRewrite: function (path, req) { return path.replace('/api', '/base/api') }
option.router: object/function, re-target option.target for specific requests.
// Use `host` and/or `path` to match requests. First match will be used.
// The order of the configuration matters.
router: {
'integration.localhost:3000' : 'http://localhost:8001', // host only
'staging.localhost:3000' : 'http://localhost:8002', // host only
'localhost:3000/api' : 'http://localhost:8003', // host + path
'/rest' : 'http://localhost:8004' // path only
}
// Custom router function
router: function(req) {
return 'http://localhost:8004';
}
option.logLevel: string, ['debug', 'info', 'warn', 'error', 'silent']. Default: 'info'
option.logProvider: function, modify or replace log provider. Default: console.
// simple replace
function logProvider(provider) {
// replace the default console log provider.
return require('winston');
}
// verbose replacement
function logProvider(provider) {
var logger = new (require('winston').Logger)();
var myCustomProvider = {
log: logger.log,
debug: logger.debug,
info: logger.info,
warn: logger.warn,
error: logger.error
}
return myCustomProvider;
}
(DEPRECATED) option.proxyHost: Use option.changeOrigin = true instead.
(DEPRECATED) option.proxyTable: Use option.router instead.
Subscribe to http-proxy events:
option.onError: function, subscribe to http-proxy's error event for custom error handling.
function onError(err, req, res) {
res.writeHead(500, {
'Content-Type': 'text/plain'
});
res.end('Something went wrong. And we are reporting a custom error message.');
}
option.onProxyRes: function, subscribe to http-proxy's proxyRes event.
function onProxyRes(proxyRes, req, res) {
proxyRes.headers['x-added'] = 'foobar'; // add new header to response
delete proxyRes.headers['x-removed']; // remove header from response
}
option.onProxyReq: function, subscribe to http-proxy's proxyReq event.
function onProxyReq(proxyReq, req, res) {
// add custom header to request
proxyReq.setHeader('x-added', 'foobar');
// or log the req
}
option.onProxyReqWs: function, subscribe to http-proxy's proxyReqWs event.
function onProxyReqWs(proxyReq, req, socket, options, head) {
// add custom header
proxyReq.setHeader('X-Special-Proxy-Header', 'foobar');
}
option.onOpen: function, subscribe to http-proxy's open event.
function onOpen(proxySocket) {
// listen for messages coming FROM the target here
proxySocket.on('data', hybiParseAndLogMessage);
}
option.onClose: function, subscribe to http-proxy's close event.
function onClose(res, socket, head) {
// view disconnected websocket connections
console.log('Client disconnected');
}
The following options are provided by the underlying http-proxy library.
path (useful for proxying to proxies)set-cookie headers. Possible values:
false (default): disable cookie rewritingcookieDomainRewrite: "new.domain". To remove the domain, use cookieDomainRewrite: ""."*" to match all domains.cookieDomainRewrite: {
"unchanged.domain": "unchanged.domain",
"old.domain": "new.domain",
"*": ""
}
{host:'www.example.org'})Use the shorthand syntax when verbose configuration is not needed. The context and option.target will be automatically configured when shorthand is used. Options can still be used if needed.
proxy('http://www.example.org:8000/api');
// proxy('/api', {target: 'http://www.example.org:8000'});
proxy('http://www.example.org:8000/api/books/*/**.json');
// proxy('/api/books/*/**.json', {target: 'http://www.example.org:8000'});
proxy('http://www.example.org:8000/api', {changeOrigin:true});
// proxy('/api', {target: 'http://www.example.org:8000', changeOrigin: true});
If you want to use the server's app.use path parameter to match requests;
Create and mount the proxy without the http-proxy-middleware context parameter:
app.use('/api', proxy({target:'http://www.example.org', changeOrigin:true}));
app.use documentation:
// verbose api
proxy('/', {target:'http://echo.websocket.org', ws:true});
// shorthand
proxy('http://echo.websocket.org', {ws:true});
// shorter shorthand
proxy('ws://echo.websocket.org');
In the previous WebSocket examples, http-proxy-middleware relies on a initial http request in order to listen to the http upgrade event. If you need to proxy WebSockets without the initial http request, you can subscribe to the server's http upgrade event manually.
var wsProxy = proxy('ws://echo.websocket.org', {changeOrigin:true});
var app = express();
app.use(wsProxy);
var server = app.listen(3000);
server.on('upgrade', wsProxy.upgrade); // <-- subscribe to http 'upgrade'
View and play around with working examples.
View the recipes for common use cases.
http-proxy-middleware is compatible with the following servers:
Sample implementations can be found in the server recipes.
Run the test suite:
# install dependencies
$ npm install
# linting
$ npm run lint
# unit tests
$ npm test
# code coverage
$ npm run cover
The MIT License (MIT)
Copyright (c) 2015-2017 Steven Chim
FAQs
The one-liner node.js proxy middleware for connect, express and browser-sync
The npm package nesto-http-proxy-middleware receives a total of 1 weekly downloads. As such, nesto-http-proxy-middleware popularity was classified as not popular.
We found that nesto-http-proxy-middleware demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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