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diff --git a/modules/http2/h2_c2.h b/modules/http2/h2_c2.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_c2__
+#define __mod_h2__h2_c2__
+
+#include <http_core.h>
+
+#include "h2.h"
+
+const char *h2_conn_mpm_name(void);
+int h2_mpm_supported(void);
+
+/* Initialize this child process for h2 secondary connection work,
+ * to be called once during child init before multi processing
+ * starts.
+ */
+apr_status_t h2_c2_child_init(apr_pool_t *pool, server_rec *s);
+
+#if !AP_HAS_RESPONSE_BUCKETS
+
+conn_rec *h2_c2_create(conn_rec *c1, apr_pool_t *parent,
+                       apr_bucket_alloc_t *buckt_alloc);
+
+/**
+ * Process a secondary connection for a HTTP/2 stream request.
+ */
+apr_status_t h2_c2_process(conn_rec *c, apr_thread_t *thread, int worker_id);
+
+#endif /* !AP_HAS_RESPONSE_BUCKETS */
+
+void h2_c2_destroy(conn_rec *c2);
+
+/**
+ * Abort the I/O processing of a secondary connection. And
+ * in-/output beams will return errors and c2->aborted is set.
+ * @param c2 the secondary connection to abort
+ * @param from the connection this is invoked from
+ */
+void h2_c2_abort(conn_rec *c2, conn_rec *from);
+
+void h2_c2_register_hooks(void);
+
+#endif /* defined(__mod_h2__h2_c2__) */