HTTP Server

HTTP Server

When I think about web, my first thought come to a server. A connection between the network and software. No matter how complex system, typically it is a thread listening on a TCP socket for incoming requests. This was the case across the HTTP protocol from its first version HTTP 0.9 until HTTP-3 when TCP was replaced by UDP based protocol QUIC protocol. You can read more about HTTP-3 in rfc9114

It receives meta information about the request and expected response in headers specifying what is expected encoding, whether the request is authenticated, or should be cached.

We receive a

import http.server
import socketserver

PORT = 3000


class MyHandler(http.server.SimpleHTTPRequestHandler):
    def do_GET(self):
        self.send_response(200)
        self.send_header('Content-type', 'text/html')
        self.send_header('X-ACTION', 'tea')
        self.end_headers()
        self.wfile.write(b'Hello, World!')


if __name__ == '__main__':
    with socketserver.TCPServer(("", PORT), MyHandler) as httpd:
        print("Serving at port", PORT)
        httpd.serve_forever()