Running chromium with a fake https proxy keep working

Question

I'm trying to understand how to correctly configure a --proxy-server for chromium and here is what I tried:

google-chrome-stable --disable-gpu --proxy-server="https=a:b@1.2.3.4:55555" --headless --dump-dom https://chromium.org

Running the browser with a totally fake proxy server credentials a:b@1.2.3.4:55555 it keeps dumping the dom which is not expected. By contrast, I expected some error related to the proxy server to occur.

Answer 1

Chrome seems to silently ignore your setting because you have specified an invalid proxy server https=a:b@1.2.3.4:55555.

When I use --proxy-server="https://a:b@1.2.3.4:55555" I'm not able to able to go to any page as you would expect. It gives me the message This site can’t be reached (ERR_NO_SUPPORTED_PROXIES).