SimpleAuthServer: A SimpleHTTPServer with authentication

SimpleAuthServer.py

import BaseHTTPServer
from SimpleHTTPServer import SimpleHTTPRequestHandler
import sys
import base64

key = ""

class AuthHandler(SimpleHTTPRequestHandler):
    ''' Main class to present webpages and authentication. '''
    def do_HEAD(self):
        print "send header"
        self.send_response(200)
        self.send_header('Content-type', 'text/html')
        self.end_headers()

    def do_AUTHHEAD(self):
        print "send header"
        self.send_response(401)
        self.send_header('WWW-Authenticate', 'Basic realm=\"Test\"')
        self.send_header('Content-type', 'text/html')
        self.end_headers()

    def do_GET(self):
        global key
        ''' Present frontpage with user authentication. '''
        if self.headers.getheader('Authorization') == None:
            self.do_AUTHHEAD()
            self.wfile.write('no auth header received')
            pass
        elif self.headers.getheader('Authorization') == 'Basic ' + key:
            print 'authorized'
            SimpleHTTPRequestHandler.do_GET(self)
            pass
        else:
            self.do_AUTHHEAD()
            self.wfile.write('not authenticated')
            pass

if __name__ == '__main__':
    if len(sys.argv) != 3:
        print 'usage SimpleAuthServer.py [port] [username:password]'
    else:
        port = int(sys.argv[1])
        key = base64.b64encode(sys.argv[2])
        print 'listening on localhost:%d with key %s' %(port, key)
        server = BaseHTTPServer.HTTPServer(('localhost', port), AuthHandler)

        print 'Starting server, use <Ctrl-C> to stop'
        server.serve_forever()