Build a Web Server

A complete HTTP server in Wyn - under 30 lines.

The Server

server = Http.listen(8080)
print("Listening on http://localhost:8080")

while true {
    req = Http.accept(server)
    parts = req.split("|")
    method = parts[0]
    path = parts[1]

    Log.info(method + " " + path)

    if path == "/" {
        Http.respond(req, 200, "text/html", "<h1>Hello from Wyn! 🐉</h1>")
    } else if path == "/api/time" {
        now = "${DateTime.now()}"
        Http.respond(req, 200, "application/json", "{\"time\": " + now + "}")
    } else {
        Http.respond(req, 404, "text/html", "Not Found")
    }
}

Run It

wyn run server.wyn

Then visit http://localhost:8080 in your browser.

Add Concurrency

Handle requests in parallel with spawn:

server = Http.listen(8080)
print("Listening on :8080")

while true {
    req = Http.accept(server)
    spawn handle(req)
}

fn handle(req: string) {
    parts = req.split("|")
    path = parts[1]
    Log.info("handling " + path)

    if path == "/" {
        Http.respond(req, 200, "text/plain", "Hello!")
    } else {
        Http.respond(req, 404, "text/html", "Not Found")
    }
}

Each request runs on its own thread pool worker - lightweight tasks, not blocking the main thread.

Build for Production

wyn build server.wyn --release -o server
./server  # ~69KB binary, starts instantly

See Also

• Networking - HTTP client and server
• Web Framework - routing and middleware
• Database - SQLite for persistence
• JSON - parse and generate JSON
• Docker Deployment - containerize your web server
• I Built a Web Server Without Installing a Single Package - real-world example
• Build a Complete REST API in 93 Lines - CRUD API tutorial