Nick Ramirez reported the following error while testing the h2-tracer.lua
script:
Lua filter 'h2-tracer' : [state-id 0] runtime error: /etc/haproxy/h2-tracer.lua:227: attempt to index a nil value (field '?') from /etc/haproxy/h2-tracer.lua:227: in function line 109.
It is caused by h2ff indexing with an out of bound value. Indeed, h2ff
is indexed with the frame type, which can potentially be > 9 (not common
nor observed during Willy's tests), while h2ff only defines indexes from
0 to 9.
The fix was provided by Willy, it consists in skipping h2ff indexing if
frame type is > 9. It was confirmed that doing so fixes the error.
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