From c0fc7f9b0c58fa3caf3cd49b83fe477a98e020c3 Mon Sep 17 00:00:00 2001
From: Chad Weider <cweider@oofn.net>
Date: Sun, 4 Mar 2012 15:04:54 -0800
Subject: [PATCH] Avoid orphaned cache files from breaking the caching layer.
 (cherry picked from commit 57d0a2e803d8efd2721c575e225bc9d90910d6d3)

---
 src/node/utils/caching_middleware.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/node/utils/caching_middleware.js b/src/node/utils/caching_middleware.js
index 29c95049f..9e62ee842 100644
--- a/src/node/utils/caching_middleware.js
+++ b/src/node/utils/caching_middleware.js
@@ -55,7 +55,7 @@ CachingMiddleware.prototype = new function () {
       var modifiedSince = (req.headers['if-modified-since']
           && new Date(req.headers['if-modified-since']));
       var lastModifiedCache = !error && stats.mtime;
-      if (lastModifiedCache) {
+      if (lastModifiedCache && responseCache[cacheKey]) {
         req.headers['if-modified-since'] = lastModifiedCache.toUTCString();
       } else {
         delete req.headers['if-modified-since'];