from http.server import HTTPServer, BaseHTTPRequestHandler


class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):

    def do_GET(self):
        self.send_response(200)
        self.end_headers()
        self.wfile.write(b'OK')
        *** Put here your command ***


httpd = HTTPServer(('localhost', 8000), SimpleHTTPRequestHandler)
httpd.serve_forever()

wget http://B's IP address:8000

curl http://B's IP address:8000