How, in the XMLRPC using HTTP proxy with password-CodePudding

Question:
Computer as the client wants to local area network (need, through a proxy server to access the network proxy server need user name and password) to access the Internet on a server in the XMLRPC service
Code, of the following is the official reference documentation. The problem is to use HTTP client. The HTTPConnection connect need to account the proxy server (), how to set up a user name and password?

 
Import. HTTP client 
The import XMLRPC. Client 
The class ProxiedTransport (XMLRPC. Client. Transport) : 
Def set_proxy (self, host, port=None, headers=None) : 
The self. The proxy=host, port 
Self. Proxy_headers=headers 

Def make_connection (self, the host) : 
Connection.=HTTP client. HTTPConnection (* the self in the proxy) 
Connection. Set_tunnel (host, headers=self. Proxy_headers) 
The self _connection=host, connection 
The return connection 

Transport=ProxiedTransport () 
Transport. Set_proxy (' proxy server - '8080) 
Server=XMLRPC. Client. ServerProxy (' http://betty.userland.com ', transport=transport) 

Print (server. Examples. GetStateName (41))