mockttp

import * as mockttp from 'mockttp'; async function runMockServer() { // Generate a CA certificate for HTTPS interception if needed // In a real test, you'd configure your client to trust this CA. const https = await mockttp.generateCACertificate(); const server = mockttp.getLocal({ https }); // Define a rule for a POST request to example.com server.forPost() .forHostname("example.com") .delay(500) // Introduce a 500ms delay .thenReply(200, "Hello world from Mockttp!"); // Define a rule for any WebSocket connection with a specific cookie server.forAnyWebSocket() .withHeaders({ cookie: 'abcd' }) .thenPassThrough({ transformRequest: { matchReplaceQuery: [/username=(.*)/, 'role=admin&username=$1'] } }); await server.start(); console.log(`Mock server started on port ${server.port}`); console.log('Intercepting example.com POST requests and transforming WebSockets.'); // In a real application, you'd now run your client code that makes requests. // For demonstration, we'll keep the server running for a bit. setTimeout(async () => { await server.stop(); console.log('Mock server stopped.'); }, 10000); } runMockServer().catch(console.error);