http-middle-proxy代理

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)

Context matching

1. 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 /api multiple
   path matching

   proxy(['/api', '/ajax', '/someotherpath'], {...}) wildcard path
   matching
   

2. proxy(’’, {…}) matches any path, all requests will be proxied.
   proxy(’/.html’, {…}) matches any path which ends with .html
   proxy(’/.html’, {…}) matches paths directly under path-absolute
   proxy(’/api//*.html’, {…}) matches requests ending with .html in
   the path of /api proxy([’/api/’, ‘/ajax/’], {…}) combine
   multiple patterns proxy([’/api/’, ‘!**/bad.json’], {…})
   exclusion

Note: In multiple path matching, you cannot use string paths and wildcard paths together.

Router

option.router：对象/函数，重新定位特定请求的option.target。
// 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';
}

custom matching

/**
 * @return {Boolean} 
 */
var filter = function(pathname, req) {
  return pathname.match('^/api') && req.method === 'GET'
}
 
var apiProxy = proxy(filter, { target: 'http://www.example.org' })