如何将标头添加到node-http-proxy响应 [英] How to Add Headers to node-http-proxy Response

问题描述

我需要在第三方服务上解决CORS，所以我想构建一个代理来添加标题Access-Control-Allow-Origin：*。

I need to solve CORS on a third party service, so I want to build a proxy to add the header "Access-Control-Allow-Origin: *".

为什么这段代码没有添加标题？

Why is this code is not adding the header?

httpProxy = require('http-proxy');

var URL = 'https://third_party_server...';

httpProxy.createServer({ secure: false, target: URL }, function (req, res, proxy) {

  res.oldWriteHead = res.writeHead;
  res.writeHead = function(statusCode, headers) {
    /* add logic to change headers here */

    res.setHeader('Access-Control-Allow-Origin', '*');
    res.setHeader('Access-Control-Allow-Methods', 'POST, GET, OPTIONS');

    res.oldWriteHead(statusCode, headers);
  }

  proxy.proxyRequest(req, res, { secure: false, target: URL });

}).listen(8000);

推荐答案

你有 proxyRes 活动可用。

这样的事情应该有效：

proxy.on('proxyRes', function(proxyRes, req, res) {
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Methods', 'POST, GET, OPTIONS');
});

完整的工作示例（好吧，当我说完全时我并不是说这是一个安全 - 失败 - 真正的代理，但它可以解决你的问题）：

Full working example (well, when I say full I do not mean this is a secure-failsafe-real proxy, but it does the job for your question):

var http = require('http'),
    httpProxy = require('http-proxy');
var proxy = httpProxy.createProxyServer({});
var server = http.createServer(function(req, res) {
    proxy.web(req, res, {
        target: 'https://third_party_server...',
        secure: false,
        ws: false,
        prependPath: false,
        ignorePath: false,
    });
});
console.log("listening on port 8000")
server.listen(8000);

// Listen for the `error` event on `proxy`.
// as we will generate a big bunch of errors
proxy.on('error', function (err, req, res) {
  console.log(err)
  res.writeHead(500, {
    'Content-Type': 'text/plain'
  });
  res.end("Oops");
});

proxy.on('proxyRes', function(proxyRes, req, res) {
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Methods', 'POST, GET, OPTIONS');
});

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