proxy: Improved error reporting
proxy: Improved error reporting

We now report the actual error message rather than a generic one

joshix/caddy,tobya/caddy,ollie314/caddy,devangels/caddy,pyed/caddy,tw4452852/caddy,pyed/caddy,joshix/caddy,dusty/caddy,DenBeke/caddy,DenBeke/caddy,tobya/caddy,tw4452852/caddy,yukimochi/caddy,captncraig/caddy,yukimochi/caddy,dusty/caddy,elcore/caddy,cez81/caddy,elcore/caddy,DenBeke/caddy,tobya/caddy,joshix/caddy,tw4452852/caddy,devangels/caddy,captncraig/caddy,cez81/caddy,devangels/caddy,cez81/caddy,pyed/caddy,tw4452852/caddy,dusty/caddy,dusty/caddy,pyed/caddy,DenBeke/caddy,tobya/caddy,elcore/caddy,ollie314/caddy,captncraig/caddy,ollie314/caddy,ollie314/caddy,yukimochi/caddy