Multithreaded Web Server (Rust Book)

A simple HTTP server that handles multiple requests concurrently using a thread pool instead of spawning a new thread per request.

How It Works

ThreadPool

A ThreadPool holds:

• Workers — a fixed number of threads (e.g., 3)
• Sender — sends jobs into a channel
• Receiver — (in each worker) receives jobs from the channel

When you call pool.execute(closure), the closure is boxed and sent through an mpsc channel. A waiting worker receives it, runs it, then goes back to sleep at recv() waiting for the next job.

Running

cargo run

Then visit:

• localhost:7878/ — returns hello.html
• localhost:7878/sleep — simulates a slow request (thread sleeps for 5s) to verify multi-threaded handling
• localhost:7878/<anything else> — returns a 404 page