TChannel: generalize request defaults
TChannel: generalize request defaults

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