s/ap_proxy_check_backend/ap_proxy_check_connection/.

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either above in ap_proxy_determine_connection(), or below in
ap_proxy_release_connection().



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Export [ap_]check_pipeline() and use it also for ap_proxy_check_connection(),
so that all the necessary checks on the connection are done before reusing it.



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Followup to r1421305.
PR 56210


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Restore AP_MODE_READBYTES cleared inadvertently in r1756060.


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Export [ap_]check_pipeline() and use it also for ap_proxy_check_connection().



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No functional change.
PR 59990


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section.


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not any potential/errorneous next response.



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Don't try to read past AP_FCGI_END_REQUEST on the backend side, it would be
a response for the next request.



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warnings when building against OpenSSL 0.9.8a.


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when building against OpenSSL 0.9.8a.


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- move IDCONST macro outside of addition #if check.
  Otherwise we break compatibility with old
  OpenSSL 0.9.8 releases.


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and ensure the field header name is truncated to a sane log width.

  Stop reflecting irrelevant data to the request error notes, particularly
  for abusive and malformed traffic the non-technical consumer of a user-agent
  has no control over.

  Simply take note where the administrator-configured limits have been exceeded,
  that administrator can find details in the error log if desired.



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using OpenSSL 1.1.0.

This API is now a no-op in OpenSSL 1.1.0 and
deprecated.


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Don't crash when ap_rgetline() returns a NULL field on ENOSPC.


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