Revert "errors not required by as/http"
Revert "errors not required by as/http"

This reverts commit 1e0ca606f8ea63eee5f671db7101d94fe650703d.

i/tchannel,i/tchannel,chenwenbin928/tchannel,sasa233/tchannel,RyanTech/tchannel,RyanTech/tchannel,chenwenbin928/tchannel,savaki/tchannel,bunnyblue/tchannel,benfleis/tchannel,chenwenbin928/tchannel,vanloswang/tchannel,benfleis/tchannel,benfleis/tchannel,savaki/tchannel,hustxiaoc/tchannel,vanloswang/tchannel,bunnyblue/tchannel,i/tchannel,bunnyblue/tchannel,savaki/tchannel,sasa233/tchannel,Zirpon/tchannel,sasa233/tchannel,RyanTech/tchannel,vanloswang/tchannel,Zirpon/tchannel,hustxiaoc/tchannel,hustxiaoc/tchannel,Zirpon/tchannel