removed symbols that supposed to be URL-encoded from alphabet
removed symbols that supposed to be URL-encoded from alphabet

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