catch the normal exit for gen_server:call
catch the normal exit for gen_server:call
CrankWheel/engine.io-cowboy,wuyingfengsui/socket.io-cowboy,CrankWheel/engine.io-cowboy,CrankWheel/engine.io-cowboy,CrankWheel/engine.io-cowboy,wuyingfengsui/socket.io-cowboy,CrankWheel/engine.io-cowboy,wuyingfengsui/socket.io-cowboy