怎么在 koa下使用 http-proxy-middleware 呢？

Question

let router = require('koa-router')();
let c2 = require('koa2-connect');
let proxy = require('http-proxy-middleware')
module.exports = router;

//个人页
router.get('/api/*', c2k(proxy({
  target: "http://localhost:3000",
  changeOrigin:true,
  pathRewrite:{
    '^/api/*':'^/internal/*'
  },
  logLevel: 'debug'
})));

以上为代码，但是运行时一直报错

Cannot read property 'on' of undefined TypeError: Cannot read property 'on' of undefined
    at makeInjectedResponse 
    UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): Error: Can't set headers after they are sent.
  ``

Answer 1

用这个模块koa-better-http-proxy

npm install koa-better-http-proxy --save

app.use(proxy('www.google.com', {
  port: 443
}));

Answer 2

用的是koa,对应的插件应该是 koa-connect

Answer 3

可以看下koa-server-http-proxy这个库，http-proxy-middleware的koa版本。