def serve(directory, port, preprocessor, verbose=True):
server_address = ('', port)
httpd = HTTPServer(server_address,
PreprocessingHTTPRequestHandler)
httpd.preprocessor = preprocessor
httpd.basepath = directory
sa = httpd.socket.getsockname()
if verbose:
print("Serving HTTP on", sa[0], "port", sa[1], "...")
httpd.serve_forever()
