The proxy you are connecting is not in your list error in GetAuthCredentials callback function

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The proxy you are connecting is not in your list error in GetAuthCredentials callback function

def main():

    check_versions() 

    sys.excepthook = cef.ExceptHook # To shutdown all CEF processes on error                            applicationSettings = { 

        "unique_request_context_per_browser": 1, "ignore_certificate_errors": 1,                                    "persist_session_cookies": 1, "persist_user_preferences": 1, "string_encoding": "utf-8",            "user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.106 Safari/537.36", 

        "context_menu": { "enabled": True, "navigation": True, "print": True, "view_source": True,            "external_browser": True, "devtools": True, }

    }

    commandLineSwitches = {

         "proxy-server": "host:port",

         "force-webrtc-ip-handling-policy": "default_public_interface_only", 

    }

    cef.Initialize(applicationSettings, commandLineSwitches)

    browser = cef.CreateBrowserSync(url="https://www.google.com/", window_title="Hello World!")    

    browser.SetClientHandler(RequestHandler("username", "password"))

    cef.MessageLoop()
    del browser
    cef.Shutdown()

class RequestHandler(object): 

    def __init__(self, username, password): 

        self.username = username 

        self.password = password 

      

    def GetAuthCredentials(self, browser, is_proxy, **_): 

        if is_proxy: resp = _['callback'].Continue(self.username, self.password)

            print(_)

            print(resp) 

            return True 

        return False 

    def check_versions(): 

         ver = cef.GetVersion() 

         assert cef.__version__ >= "57.0", "CEF Python v57.0+ required to run this"

 if __name__ == '__main__': 

      main()

That's what i get in the command line (infinite loop):

{'frame': <cefpython_py39.PyFrame object at 0x0000023E38F0B380>, 'host': 'host', 'port': port, 'realm': 'Invalid proxy credentials or missing IP Authorization.', 'scheme': 'basic', 'callback': <cefpython_py39.PyAuthCallback object at 0x0000023E36A87E30>} 

None 

{'frame': <cefpython_py39.PyFrame object at 0x0000023E38F0B3C0>, 'host': 'host', 'port': port, 'realm': 'The proxy you are connecting is not in your list.', 'scheme': 'basic', 'callback': <cefpython_py39.PyAuthCallback object at 0x0000023E36A87E30>} 

None 

{'frame': <cefpython_py39.PyFrame object at 0x0000023E38F0B3C0>, 'host': 'host', 'port': port, 'realm': 'The proxy you are connecting is not in your list.', 'scheme': 'basic', 'callback': <cefpython_py39.PyAuthCallback object at 0x0000023E36A87E30>} 

None

Cannot find any working solution for that. Maybe i'm missing something obvious, thanks for help in advance!