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Maxim Dounin 8df3ad13c5 Upstream: fixed X-Accel-Expires/Cache-Control/Expires handling.
Previously, if caching was disabled due to Expires in the past, nginx
failed to cache the response even if it was cacheable as per subsequently
parsed Cache-Control header (ticket #964).

Similarly, if caching was disabled due to Expires in the past,
"Cache-Control: no-cache" or "Cache-Control: max-age=0", caching was not
used if it was cacheable as per subsequently parsed X-Accel-Expires header.

Fix is to avoid disabling caching immediately after parsing Expires in
the past or Cache-Control, but rather set flags which are later checked by
ngx_http_upstream_process_headers() (and cleared by "Cache-Control: max-age"
and X-Accel-Expires).

Additionally, now X-Accel-Expires does not prevent parsing of cache control
extensions, notably stale-while-revalidate and stale-if-error.  This
ensures that order of the X-Accel-Expires and Cache-Control headers is not
important.

Prodded by Vadim Fedorenko and Yugo Horie.
2022-06-07 00:07:12 +03:00
auto Configure: recognize arm64 machine name as a synonym for aarch64. 2022-04-29 17:38:01 +04:00
conf MIME: added image/avif type. 2021-10-25 20:49:15 +03:00
contrib Contrib: vim syntax adjusted to save cpoptions (ticket #2276). 2022-01-22 00:28:51 +03:00
docs Year 2022. 2022-02-04 13:29:31 +03:00
misc Updated OpenSSL and zlib used for win32 builds. 2022-05-24 02:51:49 +03:00
src Upstream: fixed X-Accel-Expires/Cache-Control/Expires handling. 2022-06-07 00:07:12 +03:00
.hgtags release-1.21.6 tag 2022-01-25 18:03:52 +03:00