Stupid webserver that returns hostname and primary IP address

webserver.py

#!/usr/bin/python
import BaseHTTPServer
import socket
import fcntl
import struct

address = '0.0.0.0'
port = 12345
interface = 'eth0'

class my_webserver(BaseHTTPServer.BaseHTTPRequestHandler):
    'Simple webserving class'

    # Process GET requests
    def do_GET(self):
        global hostname
        global my_ip
        self.do_return(200, "{: <16} {}\n".format(hostname, my_ip))

    # Send response to client
    def do_return(self, code, message=""):
        global max_requests
        if (code == 200):
            self.send_response(code)
            self.send_header('Content-type', 'text/html')
            self.end_headers()
            self.wfile.write(message)
            # Close the connection so we wont block the client
            self.finish()
            self.connection.close()
        else:
            self.send_error(500)
            self.send_header('Content-type', 'text/html')
            self.end_headers()
            self.wfile.write('ERROR {}\n'.format(message))
            # Close the connection so we wont block the client
            self.finish()
            self.connection.close()

def get_ip_address(ifname):
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    return socket.inet_ntoa(fcntl.ioctl(
        s.fileno(),
        0x8915,  # SIOCGIFADDR
        struct.pack('256s', ifname[:15])
    )[20:24])

hostname = socket.gethostname()
my_ip = get_ip_address(interface)


# Fire up http server and bind to haproxy_healthcheck class
def main():
    print("Starting HTTP server on {}:{}".format(address, port))
    server = BaseHTTPServer.HTTPServer((address, port), my_webserver)
    try:
        server.serve_forever()
    except KeyboardInterrupt:
        print("Closing HTTP server")
        server.server_close()

# Run main function
main()