fixed changed -b argument processing
fixed changed -b argument processing

rodrigoac/slowhttptest,michalkoczwara/slowhttptest,shekyan/slowhttptest,shekyan/slowhttptest,blu3sh3ll/slowhttptest,drat/slowhttptest,drat/slowhttptest,michalkoczwara/slowhttptest,blu3sh3ll/slowhttptest,erikdejonge/slowhttptest,erikdejonge/slowhttptest,rodrigoac/slowhttptest