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:
            SimpleHTTPRequestHandler.do_GET(self)
            pass
        else:
            self.do_AUTHHEAD()
            self.wfile.write(self.headers.getheader('Authorization'))
            self.wfile.write('not authenticated')
            pass

def test(HandlerClass = AuthHandler,
         ServerClass = BaseHTTPServer.HTTPServer):
    BaseHTTPServer.test(HandlerClass, ServerClass)


if __name__ == '__main__':
    if len(sys.argv)<3:
        print "usage SimpleAuthServer.py [port] [username:password]"
        sys.exit()
    key = base64.b64encode(sys.argv[2])
    test()

I updated to python 3 but it is not handled properly,
(Updated using 2to3.)

Traceback (most recent call last):
   File "SimpleAuthServer.py", line 41, in
     key = base64.b64encode (sys.argv [2])
   File "/opt/rh/rh-python36/root/usr/lib64/python3.6/base64.py", line 58, in b64encode
     encoded = binascii.b2a_base64 (s, newline = False)
TypeError: a bytes-like object is required, not 'str'

I did not try the 2to3 converted version, but by modifying the 95 line of SimpleHTTPAuthServer/main.py to

SimpleHTTPAuthHandler.KEY = base64.b64encode(args.key.encode("utf-8"))

can make the program start. View here for more info.
(Although some other errors happened.)

Python3 Version, refactored to behave like python3 -m http.serve helper. Added --username and --password for basic HTTP Auth. (Authorization: Basic)

https://gist.github.com/mauler/593caee043f5fe4623732b4db5145a82

Is any chance to support post request as well, probably implement it by BaseHTTPRequestHandler?