From 10cec75a6eca72219b1586896d2b7310ef4774c8 Mon Sep 17 00:00:00 2001
From: Jeff Kaufman <jefftk@google.com>
Date: Mon, 5 Nov 2012 15:16:27 -0500
Subject: [PATCH] clear last modified

---
 src/ngx_pagespeed.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/ngx_pagespeed.cc b/src/ngx_pagespeed.cc
index d455ec455..54d573c21 100644
--- a/src/ngx_pagespeed.cc
+++ b/src/ngx_pagespeed.cc
@@ -619,6 +619,11 @@ ngx_http_pagespeed_header_filter(ngx_http_request_t* r) {
   // resources are modified to have an etag-like hash in the url.
   ngx_http_clear_etag(r);
 
+  // An page may change without the underlying file changing, because of how
+  // resources are included.  Pagespeed adds cache control headers for resources
+  // instead of using the last modified header.
+  ngx_http_clear_last_modified(r);
+
   r->filter_need_in_memory = 1;
 
   if (r->err_status == 0) {