const express = require('express'); const morgan = require("morgan"); const { createProxyMiddleware , responseInterceptor } = require('http-proxy-middleware'); // Create Express Server const app = express(); // Configuration const PORT = 3000; const HOST = "localhost"; const proxy = createProxyMiddleware({ target: 'http://example.com', changeOrigin: true, // for vhosted sites /** * IMPORTANT: avoid res.end being called automatically **/ selfHandleResponse: true, // res.end() will be called internally by responseInterceptor() /** * Intercept response and replace 'Hello' with 'Teapot' with 418 http response status code **/ on: { proxyRes: responseInterceptor(async (responseBuffer, proxyRes, req, res) => { res.statusCode = 418; // set different response status code const response = responseBuffer.toString('utf8'); return response.replace('Hello', 'Teapot'); }), }, }); app.get('/', proxy) // Start Proxy app.listen(PORT, HOST, () => { console.log(`Starting Proxy at http://${HOST}:${PORT}`); });

PS C:\Users\In-Motion\Desktop\netninja> npm ls http-proxy-middleware npm WARN config global `--global`, `--local` are deprecated. Use `--location=global` instead. netninja@1.0.0 C:\Users\In-Motion\Desktop\netninja └── http-proxy-middleware@2.0.6

Windows 10 64 bit