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diff --git a/src/shrpx_downstream_connection.h b/src/shrpx_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_DOWNSTREAM_CONNECTION_H
+#define SHRPX_DOWNSTREAM_CONNECTION_H
+
+#include "shrpx.h"
+
+#include <memory>
+
+#include "shrpx_io_control.h"
+
+namespace shrpx {
+
+class ClientHandler;
+class Upstream;
+class Downstream;
+struct DownstreamAddrGroup;
+struct DownstreamAddr;
+
+class DownstreamConnection {
+public:
+  DownstreamConnection();
+  virtual ~DownstreamConnection();
+  virtual int attach_downstream(Downstream *downstream) = 0;
+  virtual void detach_downstream(Downstream *downstream) = 0;
+
+  virtual int push_request_headers() = 0;
+  virtual int push_upload_data_chunk(const uint8_t *data, size_t datalen) = 0;
+  virtual int end_upload_data() = 0;
+
+  virtual void pause_read(IOCtrlReason reason) = 0;
+  virtual int resume_read(IOCtrlReason reason, size_t consumed) = 0;
+  virtual void force_resume_read() = 0;
+
+  virtual int on_read() = 0;
+  virtual int on_write() = 0;
+  virtual int on_timeout() { return 0; }
+
+  virtual void on_upstream_change(Upstream *upstream) = 0;
+
+  // true if this object is poolable.
+  virtual bool poolable() const = 0;
+
+  virtual const std::shared_ptr<DownstreamAddrGroup> &
+  get_downstream_addr_group() const = 0;
+  virtual DownstreamAddr *get_addr() const = 0;
+
+  void set_client_handler(ClientHandler *client_handler);
+  ClientHandler *get_client_handler();
+  Downstream *get_downstream();
+
+protected:
+  ClientHandler *client_handler_;
+  Downstream *downstream_;
+};
+
+} // namespace shrpx
+
+#endif // SHRPX_DOWNSTREAM_CONNECTION_H