add better debug() for middleware
add better debug() for middleware

RoseTHERESA/connect,tanveer12332/connect,RickyDan/connect,khirayama/connect,gtomitsuka/connect,davehorton/drachtio,keenwon/connect,dkfiresky/connect,chinazhaghai/connect,liuwei9413/connect,llwanghong/connect,behind2/connect,wghust/connect,austincitylimits/connect,senchalabs/connect,mi2oon/connect,mi2oon/connect,qitianchan/connect,khalerc/connect,lian774739140/connect