gns3-docker-appliances/basic_server/server.py

from http.server import BaseHTTPRequestHandler, HTTPServer
import os

message = "Hello, World! Here is simple HTTP response..."

if "MESSAGE" in os.environ:
    message = os.environ["MESSAGE"]

PORT = 80

print(f"Will listen on port {PORT}")

class handler(BaseHTTPRequestHandler):
    def do_GET(self):
        global message

        self.send_response(200)
        self.send_header('Content-type','text/html')
        self.end_headers()

        message = f"{message}\n"
        self.wfile.write(bytes(message, "utf8"))

with HTTPServer(('', PORT), handler) as server:
    server.serve_forever()