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diff --git a/modules/http2/h2_protocol.h b/modules/http2/h2_protocol.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_protocol__
+#define __mod_h2__h2_protocol__
+
+/**
+ * List of protocol identifiers that we support in cleartext
+ * negotiations. NULL terminated.
+ */
+extern const char *h2_protocol_ids_clear[];
+
+/**
+ * List of protocol identifiers that we support in TLS encrypted
+ * negotiations (ALPN). NULL terminated.
+ */
+extern const char *h2_protocol_ids_tls[];
+
+/**
+ * Provide a user readable description of the HTTP/2 error code-
+ * @param h2_error http/2 error code, as in rfc 7540, ch. 7
+ * @return textual description of code or that it is unknown.
+ */
+const char *h2_protocol_err_description(unsigned int h2_error);
+
+/*
+ * One time, post config initialization.
+ */
+apr_status_t h2_protocol_init(apr_pool_t *pool, server_rec *s);
+
+/**
+ * Check if the given primary connection fulfills the protocol
+ * requirements for HTTP/2.
+ * @param c the connection
+ * @param require_all != 0 iff any missing connection properties make
+ *    the test fail. For example, a cipher might not have been selected while
+ *    the handshake is still ongoing.
+ * @return != 0 iff protocol requirements are met
+ */
+int h2_protocol_is_acceptable_c1(conn_rec *c, request_rec *r, int require_all);
+
+
+#endif /* defined(__mod_h2__h2_protocol__) */