I started a proxy with command:
proxy.py --basic-auth username:password

I configured chrome proxy as below(Mac OSX):
type: Web Proxy(Http)
Host: my_host_server
Port: 8899(I use the default port)
Chekced Proxy Server Requires Password and fill in
Username: username
Passowrd: password

the snapshot as below:

I'm sure the firewall was disabled.

but still can NOT get traffic proxyed, the log of proxy server didnot show anything, just a Starting:

[root@myProxyServer ~]# /opt/rh/rh-python36/root/usr/bin/proxy.py --basic-auth username:password
2019-09-25 02:31:02,691 - INFO - run:633 - Starting server on port 8899

am I missed something? can somebody help me out of configuration? Thanks in advance:)