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06d97f935c
At the moment when a '%' character is followed by any unhandled character,
it is considered as a variable name, and if it cannot be resolved, a warning
is emitted and the configuration goes on.
When we start using log-format for redirect rules, it may happen that some
people accidently use '%' instead of '%%' without understanding the cause
of the issue. Thus we do two things here :
- if a single '%' is followed by a blank or a digit, we fix it and emit a
warning explaining how this should be done ; this ensures that existing
configs continue to work ;
- if a single '%' is followed by an unknown variable name, we report it
and explain how to emit a verbatim '%' in case this is what the user
desired.