FastAPI WebSocket Echo + Wasmer

See it in action: https://python-fastapi-websockets.wasmer.app/

This example demonstrates a minimal FastAPI WebSocket echo server with a small Bulma‑styled UI.

Open the page, it connects to a WebSocket, and anything you send is echoed back. The UI shows connection status, a message list with timestamps, and round‑trip time (RTT) for echoes.

Features

• WebSocket endpoint at /api/ws that echoes back text messages.
• Bulma‑styled UI with:
  • Status tag (Connecting / Connected / Disconnected)
  • Input and Send button (default text: "Hello Wasmer!")
  • Message list that shows timestamps and RTT
  • Reconnect button when disconnected

All logic lives in a single file: src/main.py.

Run Locally

• Install uv
• Run uv sync
• Run make run-wasmer

Deploying to Wasmer Edge (Overview)

• Install the Wasmer CLI
• Sign up for a Wasmer account at https://wasmer.io
• Run wasmer login to authenticate
• Run make deploy-wasmer