http-proxy-response-rewrite

const zlib = require('zlib'); const http = require('http'); const httpProxy = require('http-proxy'); const modifyResponse = require('http-proxy-response-rewrite'); // Create a proxy server const proxy = httpProxy.createProxyServer({ target: 'http://localhost:5001' }); // Listen for the `proxyRes` event on `proxy` to modify responses proxy.on('proxyRes', function (proxyRes, req, res) { modifyResponse(res, proxyRes.headers['content-encoding'], function (body) { if (body) { // Modify the response body (e.g., JSON manipulation) let modifiedBody = JSON.parse(body); modifiedBody.age = 2; delete modifiedBody.version; return JSON.stringify(modifiedBody); } return body; }); }); // Create your server and then proxies the request const server = http.createServer(function (req, res) { proxy.web(req, res); }).listen(5000, () => console.log('Proxy server listening on port 5000')); // Create a target server with gzipped content const targetServer = http.createServer(function (req, res) { const gzip = zlib.createGzip(); const _write = res.write; const _end = res.end; gzip.on('data', function (buf) { _write.call(res, buf); }); gzip.on('end', function () { _end.call(res); }); res.write = function (data) { gzip.write(data); }; res.end = function () { gzip.end(); }; res.writeHead(200, {'Content-Type': 'application/json', 'Content-Encoding': 'gzip'}); res.write(JSON.stringify({name: 'http-proxy-json', age: 1, version: '1.0.0'})); res.end(); }).listen(5001, () => console.log('Target server listening on port 5001'));