Github user PSUdaemon commented on a diff in the pull request:
https://github.com/apache/trafficserver/pull/330#discussion_r45298596
--- Diff: proxy/http/HttpTransactCache.cc ---
@@ -1299,7 +1299,7 @@
HttpTransactCache::match_response_to_request_conditionals(HTTPHdr *request, HTTP
ink_time_t lm_value = response->get_last_modified();
// we won't return NOT_MODIFIED if Last-modified is too recent
- if ((lm_value == 0) || (request->get_if_modified_since() <
lm_value)) {
--- End diff --
Maybe we could also add an option to force strong validation only. Then
we'd have to see a 60 second gap.
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