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node.js - 如何在 node-http-proxy 中设置 Access-Control-Allow-Headers 标头

问题描述

我正在使用coinbase-pro 库通过 localhost 上的表单向 coinbase 沙箱 api 发出发布请求。我正在尝试使用node-http-proxy来解决 CORS 错误，但没有成功。我一直在为此撞墙一段时间，任何帮助将不胜感激。

const express = require("express");
const httpProxy = require("http-proxy");

const port = 5050;

const app = express();
const proxy = httpProxy.createProxyServer({});

app.use(function(req, res) {
  delete req.headers["origin"];
  delete req.headers["referer"];
  delete req.headers["host"];


  res.setHeader("Access-Control-Allow-Origin", "*");
  res.setHeader(
    "Access-Control-Allow-Headers",
    "Content-type, cb-access-key,cb-access-passphrase,cb-access-sign,cb-access-timestamp"
  );
  res.setHeader(
    "Access-Control-Allow-Methods",
    "GET,POST,PUT,DELETE,OPTIONS"
  );

  const apiURL = 'https://api-public.sandbox.pro.coinbase.com'
  proxy.web(req, res, { target: apiURL });
});

app.listen(port, () =>
  console.log("Started proxy on port", port)
);

错误： Access to fetch at 'http://localhost:5050/orders' from origin 'http://localhost:3000' has been blocked by CORS policy: Request header field cb-access-passphrase is not allowed by Access-Control-Allow-Headers in preflight response.

标签： node.jscorshttp-proxycoinbase-apinode-http-proxy

解决方案

答案在这里：

我认为修改代理响应头不在当前文档中。

proxy.on('proxyRes', function(proxyRes, req, res) {
  console.log('Raw [target] response', JSON.stringify(proxyRes.headers, true, 2));


  proxyRes.headers['x-reverse-proxy'] = "custom-proxy";
  proxyRes.headers['cache-control'] = "max-age=10000";

  console.log('Updated [proxied] response', JSON.stringify(proxyRes.headers, true, 2));

  // Do not use res.setHeader as they won't override headers that are already defined in proxyRes
  // res.setHeader('cache-control', 'max-age=10000');
  // res.setHeader('x-reverse-proxy', 'custom-proxy');

});

关键是使用proxyRes内部"proxyRes"事件 likeproxyRes.headers[key] = value而不是依赖res.setHeader(key, value)asres.setHeader在代理目标响应标头中已经存在密钥时不起作用。

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