Added HTTP pipeline exception logging.
Added HTTP pipeline exception logging.

yonglehou/hadouken,Robo210/hadouken,Robo210/hadouken,yonglehou/hadouken,vktr/hadouken,vktr/hadouken,Robo210/hadouken,vktr/hadouken,vktr/hadouken,Robo210/hadouken,yonglehou/hadouken