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diff --git a/modules/proxy/proxy_util.h b/modules/proxy/proxy_util.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.
+ */
+
+#ifndef PROXY_UTIL_H_
+#define PROXY_UTIL_H_
+
+/**
+ * @file  proxy_util.h
+ * @brief Internal interfaces private to mod_proxy.
+ *
+ * @defgroup MOD_PROXY_PRIVATE Private
+ * @ingroup MOD_PROXY
+ * @{
+ */
+
+PROXY_DECLARE(int) ap_proxy_is_ipaddr(struct dirconn_entry *This, apr_pool_t *p);
+PROXY_DECLARE(int) ap_proxy_is_domainname(struct dirconn_entry *This, apr_pool_t *p);
+PROXY_DECLARE(int) ap_proxy_is_hostname(struct dirconn_entry *This, apr_pool_t *p);
+PROXY_DECLARE(int) ap_proxy_is_word(struct dirconn_entry *This, apr_pool_t *p);
+
+extern PROXY_DECLARE_DATA int proxy_lb_workers;
+extern PROXY_DECLARE_DATA const apr_strmatch_pattern *ap_proxy_strmatch_path;
+extern PROXY_DECLARE_DATA const apr_strmatch_pattern *ap_proxy_strmatch_domain;
+
+/**
+ * Register optional functions declared within proxy_util.c.
+ */
+void proxy_util_register_hooks(apr_pool_t *p);
+
+/** @} */
+
+#endif /* PROXY_UTIL_H_ */