webimage ProxyUsername property
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Applies to
acWebImage, acHTTP and acAutoUpgrader components as subproperty of HTTPProxy structure.  

property ProxyUsername: String;  

The ProxyUsername property specifies the username required for connection via proxy server, if it's require secure authentication.  
tip Alternativaly you can write OnProxyAuthenticationRequest event handler and specify proxy username and password dynamically.  

iiwarning If your proxy server uses some "challenge-response" authentication scheme — please make sure that ioKeepConnection option of the InternetOptions is set to True. Otherwise, connection with proxy could be dropped.  

See also
ProxyPassword and InternetOptions properties;  
OnProxyAuthenticationRequest event.