code: def set_auth(self, username, password):
      self.auth = "%s:%s" % (username, password)
  
imports: import base64
  import http.server
  import select
  import socket
  import socketserver
  import threading
  from urllib.request import urlopen
label_desc: Use image node_id 5 for calling the ProxyServerThread obj's underlying member method code with example usage: obj.set_auth(username, password) without return types