Subject: [HTTP/3]Sending reserved frame before SETTINGS

From: Renjie Tang <[email-masked]>
Date: Fri, 31 Jan 2020 14:02:44 -0800

Hi all,

When I was implementing greasing for HTTP/3 frames, I came across a
potential confusion.

Presumably, if a non-reserved unknown frame is received before SETTINGS on
a control stream, the connection should be closed.

But if a reserved frame is received before SETTINGS frame on a control
stream, does it count as an error and close the connection? Or should
it simply be ignored because it has no semantic meaning?

Thanks!
Renjie