Entity tags: basic support in not modified filter.

This includes handling of ETag headers (if present in a response) with
basic support for If-Match, If-None-Match conditionals in not modified
filter.

Note that the "r->headers_out.last_modified_time == -1" check in the not
modified filter is left as is intentionally.  It's to prevent handling
of If-* headers in case of proxy without cache (much like currently
done with If-Modified-Since).

1 files changed, 2 insertions, 0 deletions

diff --git a/src/http/ngx_http_request.h b/src/http/ngx_http_request.h
index ec946c5a6..b6ff8983a 100644
--- a/src/http/ngx_http_request.h
+++ b/src/http/ngx_http_request.h
@@ -172,6 +172,8 @@ typedef struct {
     ngx_table_elt_t                  *connection;
     ngx_table_elt_t                  *if_modified_since;
     ngx_table_elt_t                  *if_unmodified_since;
+    ngx_table_elt_t                  *if_match;
+    ngx_table_elt_t                  *if_none_match;
     ngx_table_elt_t                  *user_agent;
     ngx_table_elt_t                  *referer;
     ngx_table_elt_t                  *content_length;