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diff --git a/modules/http2/h2_c1_io.h b/modules/http2/h2_c1_io.h
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+++ b/modules/http2/h2_c1_io.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_c1_io__
+#define __mod_h2__h2_c1_io__
+
+struct h2_config;
+struct h2_session;
+
+/* h2_io is the basic handler of a httpd connection. It keeps two brigades,
+ * one for input, one for output and works with the installed connection
+ * filters.
+ * The read is done via a callback function, so that input can be processed
+ * directly without copying.
+ */
+typedef struct {
+    struct h2_session *session;
+    apr_bucket_brigade *output;
+
+    int is_tls;
+    int unflushed;
+    apr_time_t cooldown_usecs;
+    apr_int64_t warmup_size;
+    
+    apr_size_t write_size;
+    apr_time_t last_write;
+    apr_int64_t bytes_read;
+    apr_int64_t bytes_written;
+    
+    int buffer_output;
+    apr_off_t buffered_len;
+    apr_off_t flush_threshold;
+    unsigned int is_flushed : 1;
+    unsigned int is_passing : 1;
+
+    char *scratch;
+    apr_size_t ssize;
+    apr_size_t slen;
+} h2_c1_io;
+
+apr_status_t h2_c1_io_init(h2_c1_io *io, struct h2_session *session);
+
+/**
+ * Append data to the buffered output.
+ * @param buf the data to append
+ * @param length the length of the data to append
+ */
+apr_status_t h2_c1_io_add_data(h2_c1_io *io,
+                         const char *buf,
+                         size_t length);
+
+apr_status_t h2_c1_io_add(h2_c1_io *io, apr_bucket *b);
+
+apr_status_t h2_c1_io_append(h2_c1_io *io, apr_bucket_brigade *bb);
+
+/**
+ * Pass any buffered data on to the connection output filters.
+ * @param io the connection io
+ */
+apr_status_t h2_c1_io_pass(h2_c1_io *io);
+
+/**
+ * if there is any data pendiong or was any data send
+ * since the last FLUSH, send out a FLUSH now.
+ */
+apr_status_t h2_c1_io_assure_flushed(h2_c1_io *io);
+
+/**
+ * Check if the buffered amount of data needs flushing.
+ */
+int h2_c1_io_needs_flush(h2_c1_io *io);
+
+/**
+ * Check if we have output pending.
+ */
+int h2_c1_io_pending(h2_c1_io *io);
+
+struct h2_session;
+
+/**
+ * Read c1 input and pass it on to nghttp2.
+ * @param session the session
+ * @param when_pending != 0 if only pending input (sitting in filters)
+ *                     needs to be read
+ */
+apr_status_t h2_c1_read(struct h2_session *session);
+
+#endif /* defined(__mod_h2__h2_c1_io__) */