as/http: add support for array values (e.g. set-cookie)
as/http: add support for array values (e.g. set-cookie)

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