How to set up a proxy with username and password for Cronet

[wmm1996528]

for example:
http://www:123456@120.120.120.120:7777

[tiger414]

My proxy look like as http://www:123456@120.120.120.120:7777,but the response is : net::ERR_NO_SUPPORTED_PROXIES
From the netlog, I can see the proxy is null. How can I solve the problem?

{"params":{"proxy_info":""},"phase":0,"source":{"id":5,"start_time":"2074655806","type":30},"time":"2074655806","type":31},
{"phase":2,"source":{"id":5,"start_time":"2074655806","type":30},"time":"2074655806","type":29},
{"params":{"proxy_chain":""},"phase":0,"source":{"id":5,"start_time":"2074655806","type":30},"time":"2074655806","type":179}

[Ghxst]

I don't think cronet supports username and password auth for proxies, you would have to do it manually (listen for the proxy auth request and then send the creds) https://http.dev/proxy-authenticate