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diff --git a/modules/http2/h2_alt_svc.h b/modules/http2/h2_alt_svc.h
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+++ b/modules/http2/h2_alt_svc.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 __mod_h2__h2_alt_svc__
+#define __mod_h2__h2_alt_svc__
+
+typedef struct h2_alt_svc h2_alt_svc;
+
+struct h2_alt_svc {
+    const char *alpn;
+    const char *host;
+    int port;
+};
+
+void h2_alt_svc_register_hooks(void);
+
+/**
+ * Parse an Alt-Svc specifier as described in "HTTP Alternative Services"
+ * (https://tools.ietf.org/html/draft-ietf-httpbis-alt-svc-04)
+ * with the following changes:
+ * - do not percent encode token values
+ * - do not use quotation marks
+ */
+h2_alt_svc *h2_alt_svc_parse(const char *s, apr_pool_t *pool);
+
+
+#endif /* defined(__mod_h2__h2_alt_svc__) */