Fix proxy error.
Fix proxy error.

close #669

related issue:
https://bugzilla.mozilla.org/show_bug.cgi?id=1132522

kehugter/adsbypasser,tosunkaya/adsbypasser,MNBuyskih/adsbypasser,tablesmit/adsbypasser,tablesmit/adsbypasser,MNBuyskih/adsbypasser,MNBuyskih/adsbypasser,tosunkaya/adsbypasser,xor10/adsbypasser,xor10/adsbypasser,xor10/adsbypasser,tablesmit/adsbypasser,kehugter/adsbypasser,kehugter/adsbypasser,tosunkaya/adsbypasser