Hello!
...
Maxim Dounin писал 2020-09-22 23:19:
Quoting the documentation (http://nginx.org/r/limit_conn_zone):
: Requests with an empty key value are not accounted.
That is, limit_conn can be used conditionally without any
code changes. The same applies to limit_req.
Yes, I know about that feature. The problem with that approach is a
complication of the
process to compute the value of a "key". We tried that before (with a
cascade of "map" directives)
and configuration became unreadable and very hard to understand when you
add another indirection
level to force a "key" to be an empty value depending on another
condition. That was an incentive
for this patch.
This is especially true when there are several "limit_conn" directives
in one location
to limit user sessions by different identification attributes (and all
of those attirbutes
need to be "emptied" on a condition).
With best regards,
Sergei Turchanov.
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