code: def parse_proxy_line(line):
      
  
      line = line.strip()
      match = RE_SIMPLE_PROXY.search(line)
      if match:
          return match.group(1), match.group(2), None, None
  
      match = RE_AUTH_PROXY.search(line)
      if match:
          host, port, user, pwd = match.groups()
          return host, port, user, pwd
  
      raise InvalidProxyLine('Invalid proxy line: %s' % line)
docs: Parse proxy details from the raw text line.
  
      The text line could be in one of the following formats:
      * host:port
      * host:port:username:password