https://issues.apache.org/bugzilla/show_bug.cgi?id=48241

           Summary: mod_cache is missing hit/miss indication to the error
                    log/env vars
           Product: Apache httpd-2
           Version: 2.3-HEAD
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: mod_cache
        AssignedTo: [email protected]
        ReportedBy: [email protected]


Read an inquiry about logging cache hits and misses in the access log (or
control what is logged in the access log using an env test)

mod_cache should record a 'cache-hit' flag on success or failure if caching was
configured.  E.g. '1' is a hit, '0' is a failure, uninitialized was no attempt.

What makes this more severe is that nothing about the cache behavior is
captured in the debug-level error log, which means there is no guidance of
whether the cache attempted a lookup and encountered success or failure (unless
there is a hard error about accessing the respective cache repository).

Finally there is no debug-level error logging to indicate an element was added
to the cache (or not added, and perhaps what header circumvented this), again a
serious omission for diagnostics of cache configuration.

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