code: def validate(self, proxy_ip, client_ip):
          
  
          # First, look up the proxy
          if self.pseudo_proxy:
              proxy = self.pseudo_proxy
          elif proxy_ip not in self.proxies:
              return False
          else:
              proxy = self.proxies[proxy_ip]
  
          # Now, verify that the client is valid
          return client_ip in proxy
docs: Looks up the proxy identified by its IP, then verifies that
          the given client IP may be introduced by that proxy.
  
          :param proxy_ip: The IP address of the proxy.
          :param client_ip: The IP address of the supposed client.
  
          :returns: True if the proxy is permitted to introduce the
                    client; False if the proxy doesn't exist or isn't
                    permitted to introduce the client.