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diff --git a/src/shrpx_http2_downstream_connection.h b/src/shrpx_http2_downstream_connection.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2012 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef SHRPX_HTTP2_DOWNSTREAM_CONNECTION_H
+#define SHRPX_HTTP2_DOWNSTREAM_CONNECTION_H
+
+#include "shrpx.h"
+
+#include <openssl/ssl.h>
+
+#include <nghttp2/nghttp2.h>
+
+#include "shrpx_downstream_connection.h"
+
+namespace shrpx {
+
+struct StreamData;
+class Http2Session;
+class DownstreamConnectionPool;
+
+class Http2DownstreamConnection : public DownstreamConnection {
+public:
+  Http2DownstreamConnection(Http2Session *http2session);
+  virtual ~Http2DownstreamConnection();
+  virtual int attach_downstream(Downstream *downstream);
+  virtual void detach_downstream(Downstream *downstream);
+
+  virtual int push_request_headers();
+  virtual int push_upload_data_chunk(const uint8_t *data, size_t datalen);
+  virtual int end_upload_data();
+
+  virtual void pause_read(IOCtrlReason reason) {}
+  virtual int resume_read(IOCtrlReason reason, size_t consumed);
+  virtual void force_resume_read() {}
+
+  virtual int on_read();
+  virtual int on_write();
+  virtual int on_timeout();
+
+  virtual void on_upstream_change(Upstream *upstream) {}
+
+  // This object is not poolable because we don't have facility to
+  // migrate to another Http2Session object.
+  virtual bool poolable() const { return false; }
+
+  virtual const std::shared_ptr<DownstreamAddrGroup> &
+  get_downstream_addr_group() const;
+  virtual DownstreamAddr *get_addr() const;
+
+  int send();
+
+  void attach_stream_data(StreamData *sd);
+  StreamData *detach_stream_data();
+
+  int submit_rst_stream(Downstream *downstream,
+                        uint32_t error_code = NGHTTP2_INTERNAL_ERROR);
+
+  Http2DownstreamConnection *dlnext, *dlprev;
+
+private:
+  Http2Session *http2session_;
+  StreamData *sd_;
+};
+
+} // namespace shrpx
+
+#endif // SHRPX_HTTP2_DOWNSTREAM_CONNECTION_H