ngx.req.raw_header() err http v2 not supported yet

[chaclee]

when i use ngx.print(ngx.req.raw_header())

not support http2?

2017/02/08 09:39:04 [error] 9681#0: *41 lua entry thread aborted: runtime error: /home/taoyu/web/index.lua:63: http v2 not supported yet
stack traceback:
coroutine 0:
[C]: in function 'raw_header'
/home/taoyu/web/index.lua:63: in function </home/taoyu/web/index.lua:1>, client: 119.98.107.52, server: taoyu.me, request: "GET / HTTP/2.0", host: "taoyu.me"

[spacewander]

https://github.com/openresty/lua-nginx-module#ngxreqraw_header
The HTTP/2 support of ngx.raw_header is still on TODO list.