Echo incoming HTTP requests using the Python3 `http.server` module.

echohttpd.py

#!/usr/bin/env python3
import argparse
from http.server import HTTPServer, BaseHTTPRequestHandler


class RequestHandler(BaseHTTPRequestHandler):
    """Print request headers/body and respond with empty JSON object."""

    def do_GET(self):
        self.send_response(200)
        print(self.headers)
        self.end_headers()
        self.wfile.write(b'{}')

    def do_POST(self):
        self.do_GET()

        content_length = int(self.headers['content-length'])
        if content_length:
            print(self.rfile.read(content_length).decode())


    do_PUT = do_POST
    do_PATCH = do_POST
    do_DELETE = do_GET


if __name__ == "__main__":

    parser = argparse.ArgumentParser(
        description="Run a simple HTTP server that prints incoming requests."
    )
    parser.add_argument(
        "port",
        type=int,
        nargs='?',
        default=8001,
        help="The port the HTTP server listens on.",
    )

    args = parser.parse_args()
    print(f"Listening on localhost:{args.port}")
    server = HTTPServer(("", args.port), RequestHandler)
    server.serve_forever()