Hi all,
RFC2616 allows us to serve stale content during outages:
/* RFC2616 13.8 Errors or Incomplete Response Cache Behavior:
* If a cache receives a 5xx response while attempting to
revalidate an
* entry, it MAY either forward this response to the requesting
client,
* or act as if the server failed to respond. In the latter case,
it MAY
* return a previously received response unless the cached entry
* includes the "must-revalidate" cache-control directive (see
section
* 14.9).
*/
The next patch teaches mod_cache how to optionally serve stale content
should a backend be responding with 5xx errors, as per the RFC above.
In order to make this possible, the cache_out_filter needed to be
cleaned up so that it cleanly discarded data before the EOS bucket
(instead of ignoring it, as before). The cache_status hook needed to
be updated so that r->err_headers_out could be passed to it.
Regards,
Graham
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