Index: modules/cache/mod_cache.c
===================================================================
--- modules/cache/mod_cache.c	(Revision 687129)
+++ modules/cache/mod_cache.c	(Arbeitskopie)
@@ -56,9 +56,14 @@
     apr_bucket_brigade *out;
     ap_filter_t *next;
     ap_filter_rec_t *cache_out_handle;
+    int remove_due_to_method = 0;
 
+    if ((r->method_number == M_POST) || (r->method_number == M_PUT) ||
+        (r->method_number == M_DELETE)) {
+        remove_due_to_method = 1;
+    }
     /* Delay initialization until we know we are handling a GET */
-    if (r->method_number != M_GET) {
+    else if (r->method_number != M_GET) {
         return DECLINED;
     }
 
@@ -92,8 +97,17 @@
 
     /* First things first - does the request allow us to return
      * cached information at all? If not, just decline the request.
+     * If remove_due_to_method is set we have a POST, DELETE or PUT
+     * request on the resource which according to RFC2616 13.1 causes
+     * a possible existing cached resource to be invalided and
+     * ejected from the cache. It is perfectly possible that POST, DELETE or
+     * PUT on this resource is protected while a GET on this resource that
+     * caused the resource to be cached is not. So we should not DECLINE here.
+     * If remove_due_to_method is set it is guaranteed anyway that we DECLINE
+     * later, but we need to have cache_select run before to be able to
+     * eject the cached resource from the cache.
      */
-    if (auth) {
+    if (auth && !remove_due_to_method) {
         return DECLINED;
     }
 
@@ -108,6 +122,16 @@
      *   return OK
      */
     rv = cache_select(r);
+    /*
+     * Eject a possible cached resource from cache if handle a POST, DELETE or PUT
+     * on this resource.
+     * Note: cache_remove_url can handle the case when no cached resource
+     * was found by cache_select.
+     */
+    if (remove_due_to_method) {
+        cache_remove_url(cache, r->pool);
+        return DECLINED;
+    }
     if (rv != OK) {
         if (rv == DECLINED) {
             if (!lookup) {