Index: modules/cache/mod_cache.c
===================================================================
--- modules/cache/mod_cache.c	(revision 952828)
+++ modules/cache/mod_cache.c	(working copy)
@@ -465,11 +465,13 @@
      * They are tested here one by one to be clear and unambiguous.
      */
     if (r->status != HTTP_OK && r->status != HTTP_NON_AUTHORITATIVE
+        && r->status != HTTP_PARTIAL_CONTENT
         && r->status != HTTP_MULTIPLE_CHOICES
         && r->status != HTTP_MOVED_PERMANENTLY
         && r->status != HTTP_NOT_MODIFIED) {
         /* RFC2616 13.4 we are allowed to cache 200, 203, 206, 300, 301 or 410
-         * We don't cache 206, because we don't (yet) cache partial responses.
+         * We allow the caching of 206, but a cache implementation might choose
+         * to decline to cache a 206 if it doesn't know how to.
          * We include 304 Not Modified here too as this is the origin server
          * telling us to serve the cached copy.
          */