Cache: send conditional requests only for cached 200/206 responses.

RFC7232 says:

   The 304 (Not Modified) status code indicates that a conditional GET
   or HEAD request has been received and would have resulted in a 200
   (OK) response if it were not for the fact that the condition
   evaluated to false.

which means that there is no reason to send requests with "If-None-Match"
and/or "If-Modified-Since" headers for responses cached with other status
codes.

Also, sending conditional requests for responses cached with other status
codes could result in a strange behavior, e.g. upstream server returning
304 Not Modified for cached 404 Not Found responses, etc.

Signed-off-by: Piotr Sikora <piotr@cloudflare.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
index c3f4f05d2..ee4bfc06d 100644
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -177,6 +177,8 @@ ngx_http_file_cache_new(ngx_http_request_t *r)
     c->file.log = r->connection->log;
     c->file.fd = NGX_INVALID_FILE;
 
+    c->last_modified = -1;
+
     return NGX_OK;
 }