Improve error logging
Improve error logging

Always log full error information including request & response in
handleResponse.

wikimedia/restbase,Pchelolo/restbase,gwicke/restbase,eevans/restbase,wikimedia/mediawiki-services-restbase,Krenair/restbase,d00rman/restbase,physikerwelt/restbase,wikimedia/restbase,milimetric/restbase,physikerwelt/restbase,cscott/restbase,eevans/restbase,gwicke/restbase,milimetric/restbase,Pchelolo/restbase,inverno/restbase,wikimedia/hyperswitch,cscott/restbase,inverno/restbase,Krenair/restbase,wikimedia/mediawiki-services-restbase,d00rman/restbase