I'm Using latest version of httrack on linux host

Specifying proxy using command line switch works fine:
httrack <url> -P <user>:<pass>@<proxy address>:<proxy port>

but adding "proxy <user>:<pass>@<proxy address>:<proxy port>" in .httrackrc
fails with the following message in the logs:

Error: 	"Proxy authorization required" (407) at link <url>(from
primary/primary)


Investigating further, I'v found in the log file (by using "--debug-headers")
switch that the arguments of "Proxy-Authorization" header is been converted to
lowercase before being base64 encoded.