Entity tags: explicit flag to skip not modified filter.

Previously, last_modified_time was tested against -1 to check if the
not modified filter should be skipped.  Notably, this prevented nginx
from additional If-Modified-Since (et al.) checks on proxied responses.
Such behaviour is suboptimal in some cases though, as checks are always
skipped on responses from a cache with ETag only (without Last-Modified),
resulting in If-None-Match being ignored in such cases.  Additionally,
it was not possible to return 412 from the If-Unmodified-Since if last
modification time was not known for some reason.

This change introduces explicit r->disable_not_modified flag instead,
which is set by ngx_http_upstream_process_headers().

1 files changed, 1 insertions, 0 deletions

diff --git a/src/http/ngx_http_request.h b/src/http/ngx_http_request.h
index 0d3a79915..f6ea6fb56 100644
--- a/src/http/ngx_http_request.h
+++ b/src/http/ngx_http_request.h
@@ -528,6 +528,7 @@ struct ngx_http_request_s {
     unsigned                          filter_need_temporary:1;
     unsigned                          allow_ranges:1;
     unsigned                          single_range:1;
+    unsigned                          disable_not_modified:1;
 
 #if (NGX_STAT_STUB)
     unsigned                          stat_reading:1;