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diff --git a/src/shrpx_http2_upstream.h b/src/shrpx_http2_upstream.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_UPSTREAM_H
+#define SHRPX_HTTP2_UPSTREAM_H
+
+#include "shrpx.h"
+
+#include <memory>
+
+#include <ev.h>
+
+#include <nghttp2/nghttp2.h>
+
+#include "shrpx_upstream.h"
+#include "shrpx_downstream_queue.h"
+#include "memchunk.h"
+#include "buffer.h"
+
+using namespace nghttp2;
+
+namespace shrpx {
+
+class ClientHandler;
+class HttpsUpstream;
+
+class Http2Upstream : public Upstream {
+public:
+  Http2Upstream(ClientHandler *handler);
+  virtual ~Http2Upstream();
+  virtual int on_read();
+  virtual int on_write();
+  virtual int on_timeout(Downstream *downstream);
+  virtual int on_downstream_abort_request(Downstream *downstream,
+                                          unsigned int status_code);
+  virtual int
+  on_downstream_abort_request_with_https_redirect(Downstream *downstream);
+  virtual ClientHandler *get_client_handler() const;
+
+  virtual int downstream_read(DownstreamConnection *dconn);
+  virtual int downstream_write(DownstreamConnection *dconn);
+  virtual int downstream_eof(DownstreamConnection *dconn);
+  virtual int downstream_error(DownstreamConnection *dconn, int events);
+
+  void add_pending_downstream(std::unique_ptr<Downstream> downstream);
+  void remove_downstream(Downstream *downstream);
+
+  int rst_stream(Downstream *downstream, uint32_t error_code);
+  int terminate_session(uint32_t error_code);
+  int error_reply(Downstream *downstream, unsigned int status_code);
+
+  virtual void pause_read(IOCtrlReason reason);
+  virtual int resume_read(IOCtrlReason reason, Downstream *downstream,
+                          size_t consumed);
+
+  virtual int on_downstream_header_complete(Downstream *downstream);
+  virtual int on_downstream_body(Downstream *downstream, const uint8_t *data,
+                                 size_t len, bool flush);
+  virtual int on_downstream_body_complete(Downstream *downstream);
+
+  virtual void on_handler_delete();
+  virtual int on_downstream_reset(Downstream *downstream, bool no_retry);
+  virtual int send_reply(Downstream *downstream, const uint8_t *body,
+                         size_t bodylen);
+  virtual int initiate_push(Downstream *downstream, const StringRef &uri);
+  virtual int response_riovec(struct iovec *iov, int iovcnt) const;
+  virtual void response_drain(size_t n);
+  virtual bool response_empty() const;
+
+  virtual Downstream *on_downstream_push_promise(Downstream *downstream,
+                                                 int32_t promised_stream_id);
+  virtual int
+  on_downstream_push_promise_complete(Downstream *downstream,
+                                      Downstream *promised_downstream);
+  virtual bool push_enabled() const;
+  virtual void cancel_premature_downstream(Downstream *promised_downstream);
+
+  bool get_flow_control() const;
+  // Perform HTTP/2 upgrade from |upstream|. On success, this object
+  // takes ownership of the |upstream|. This function returns 0 if it
+  // succeeds, or -1.
+  int upgrade_upstream(HttpsUpstream *upstream);
+  void start_settings_timer();
+  void stop_settings_timer();
+  int consume(int32_t stream_id, size_t len);
+  void log_response_headers(Downstream *downstream,
+                            const std::vector<nghttp2_nv> &nva) const;
+  void start_downstream(Downstream *downstream);
+  void initiate_downstream(Downstream *downstream);
+
+  void submit_goaway();
+  void check_shutdown();
+  // Starts graceful shutdown period.
+  void start_graceful_shutdown();
+
+  int prepare_push_promise(Downstream *downstream);
+  int submit_push_promise(const StringRef &scheme, const StringRef &authority,
+                          const StringRef &path, Downstream *downstream);
+
+  // Called when new request has started.
+  void on_start_request(const nghttp2_frame *frame);
+  int on_request_headers(Downstream *downstream, const nghttp2_frame *frame);
+
+  DefaultMemchunks *get_response_buf();
+
+  size_t get_max_buffer_size() const;
+
+  int redirect_to_https(Downstream *downstream);
+
+private:
+  DefaultMemchunks wb_;
+  std::unique_ptr<HttpsUpstream> pre_upstream_;
+  DownstreamQueue downstream_queue_;
+  ev_timer settings_timer_;
+  ev_timer shutdown_timer_;
+  ev_prepare prep_;
+  ClientHandler *handler_;
+  nghttp2_session *session_;
+  size_t max_buffer_size_;
+  // The number of requests seen so far.
+  size_t num_requests_;
+  bool flow_control_;
+};
+
+nghttp2_session_callbacks *create_http2_upstream_callbacks();
+
+} // namespace shrpx
+
+#endif // SHRPX_HTTP2_UPSTREAM_H