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r->headers when mod_cache is enabled and the response
is cached for the first time.

Submitted by: elu
Reviewed by: ylavic, minfrin


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can't create new (clear) slots while previous children gracefully stopping
still use the old ones (e.g. Windows, OS2). PR 58024.

Submitted by: ylavic
Reviewed by: jim, minfrin


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PR 57785

Submitted by: niq
Reviewed by: jim, minfrin


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records for scalability.

Submitted by: Yingqi Lu <yingqi.lu@intel.com>, Jeff Trawick,
              Jim Jagielski, Yann Ylavic

Reviewed by: ylavic, jim, minfrin


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(r1380525 on trunk)

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 * Do not reset the retry timeout if the worker is in error at this stage even
   if the connection to the backend was successful. It was likely set into
   error by a different thread / process in parallel e.g. for a timeout or
   bad status. We should respect this and should not continue with a connection
   via this worker even if we got one.


* Do a more complete cleanup here. At this point we cannot end up with something useful with the data we created so far.
Submitted by: rpluem
Reviewed/backported by: jim


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Add in finding LUA installed via Macports and others


accept both 5.1 and 5.2, so make messages clear

Reviewed/backported by: jim


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