bneradt opened a new pull request, #13109:
URL: https://github.com/apache/trafficserver/pull/13109
Allow custom log formats to fall back between header fields with `??` so
configs can log a secondary header when the primary one is absent. This keeps
the feature in the existing `%<...>` syntax and preserves the current
distinction between missing and empty values.
This also:
- Allows overriding the default static fallback from `-` to some
user-specified quoted string literal.
- Adds support for a final non-header log field (e.g., chi, cqup) as the
fallback term, letting users write expressions like %<{x-remote-ip}cqh??chi>.
(cherry picked from commit c478245dfb6ead66186c2b413371f6ea4cda4d3d)
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