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diff --git a/modules/cache/cache_storage.h b/modules/cache/cache_storage.h
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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file cache_storage.h
+ * @brief Cache Storage Functions
+ *
+ * @defgroup Cache_storage  Cache Storage Functions
+ * @ingroup  MOD_CACHE
+ * @{
+ */
+
+#ifndef CACHE_STORAGE_H
+#define CACHE_STORAGE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "mod_cache.h"
+#include "cache_util.h"
+
+/**
+ * cache_storage.c
+ */
+int cache_remove_url(cache_request_rec *cache, request_rec *r);
+int cache_create_entity(cache_request_rec *cache, request_rec *r,
+                        apr_off_t size, apr_bucket_brigade *in);
+int cache_select(cache_request_rec *cache, request_rec *r);
+
+/**
+ * invalidate a specific URL entity in all caches
+ *
+ * All cached entities for this URL are removed, usually in
+ * response to a POST/PUT or DELETE.
+ *
+ * This function returns OK if at least one entity was found and
+ * removed, and DECLINED if no cached entities were removed.
+ * @param cache cache_request_rec
+ * @param r request_rec
+ */
+int cache_invalidate(cache_request_rec *cache, request_rec *r);
+
+apr_status_t cache_generate_key_default(request_rec *r, apr_pool_t* p,
+        const char **key);
+
+/**
+ * Merge in cached headers into the response
+ * @param h cache_handle_t
+ * @param r request_rec
+ * @param top headers to be applied
+ * @param bottom headers to be overwritten
+ * @param revalidation true if revalidation is taking place
+ */
+void cache_accept_headers(cache_handle_t *h, request_rec *r, apr_table_t *top,
+        apr_table_t *bottom, int revalidation);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !CACHE_STORAGE_H */
+/** @} */