HTTP2 DATA frames with 0 length

[Muhui Jiang]

Hi

I am using nginx 1.9.15. I noticed when I made a HTTP2 request to the
nginx. It will send the data frames that carry the object first. But end
with a data frame whose length is zero indicating the Data end flag.

I am curious why you guys design in this way. I think we don't need this
extra data frame. Maybe nginx has already fix this, If so, could you tell
me the exact version.. Many Thanks

Regards
Muhui
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