document that certain headers are mandatory
document that certain headers are mandatory

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