http is not https, try 
->proxy('https' , 'https://192.168.250.11:8118/');

[download]

In reply to Re: WWW::Mechanize (and LWP) should use CONNECT for HTTPS request when a proxy is used? by Anonymous Monk
in thread WWW::Mechanize (and LWP) should use CONNECT for HTTPS request when a proxy is used? by spunk

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