Hi,
we are getting quite a lot of these warnings about using uninitialized
variables, although we have “set” directive for each variable in every
server block. I understand the fact, that it happens when the request is
not valid and the rewrite module handler does not run, but this also
happens on valid requests (valid headers, valid request line, correctly
detected & set server block, …) AND we are unable to reproduce it.
Issuing the same request with the same headers to the same instance of
nginx is unfortunately not enough to regenerate the warning.
Does anybody have some examples of situations in which the rewrite
handler will not run therefore these variables will seem as
uninitialized? Or can you point me to what additional info I can
provide?
FYI: I know I can mute the warnings, but when the variables are
uninitialized and they are used in the “if=“ of “access_log” directive
it then does not work as it should 
Regards,
Tomas Kvasnicka