This is perfect if you want to migrate from Express.JS (or any other framework) to Hono without Downtime:
Just include this Proxy Server Endpoint at the End of your Hono Endpoints (usually index.ts):
// PROXY SERVER ENDPOINT
app.all('/*', async (c) => {
const legacyBackend = 'http://localhost:3000'; // proxy target
const newBackend = 'http://localhost:8787'; // proxy server location