endpoint-handler: factor out handleArg1
endpoint-handler: factor out handleArg1

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