Added precondition safety check to cacheResponse API and added docstring
Added precondition safety check to cacheResponse API and added docstring

yimajo/Alamofire,easyui/Alamofire,Alamofire/Alamofire,Alamofire/Alamofire,antigp/Alamofire,antigp/Alamofire,easyui/Alamofire,yimajo/Alamofire