transport: send initial conn-level window update, don't send both Host and :authority
transport: send initial conn-level window update, don't send both Host and :authority

Works against ip.appspot.com now.

raboof/net,gomini/net,cmars/tools,cesanta/goxnet,raboof/net,cmars/tools,albertjin/golang-net,albertjin/golang-net,cesanta/goxnet,cmars/tools,DramaFever/golang.org-x-net,cmars/tools,gomini/net,golang/net,DramaFever/golang.org-x-net