Waymark / Routes / vite.dev Proxy frontend API requests to a backend server during Vite dev with server.proxy
domain: vite.dev · 8 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checked community attestations: 0✓ / 0✗
Documented steps Create or edit vite.config.js/ts and export defineConfig from 'vite'. Add a server.proxy object. Use string shorthand for passthrough: '/foo': 'http://localhost:4567', or an options object for control. For rewriting the path, use the options form with rewrite: (path) => path.replace(/^\/api/, '') so /api/users hits backend as /users. Set changeOrigin: true when the target backend resolves host from the Host header. Prefix each proxy key with the configured base when base is a non-relative path (e.g. base '/app/' -> '/app/api'). For websockets or socket.io add ws: true and target a ws:// URL; use rewriteWsOrigin: true only if you control the upstream. Keys starting with ^ are treated as RegExp, e.g. '^/fallback/.*'. Run npm run dev and confirm requests matching the prefix are forwarded (Vite no longer transforms matched requests). Known gotchas Matched proxied requests are NOT transformed by Vite, so HMR/import rewriting does not apply to them. With a non-relative base you must include the base prefix in the proxy key or requests 404. rewriteWsOrigin: true can leave websocket proxying open to CSRF attacks; only enable when needed. For custom middleware use a plugin's configureServer hook instead of server.proxy. server.proxy extends http-proxy-3; configure(proxy, options) receives the proxy instance for advanced wiring.
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