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diff --git a/src/shrpx_api_downstream_connection.h b/src/shrpx_api_downstream_connection.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2016 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_API_DOWNSTREAM_CONNECTION_H
+#define SHRPX_API_DOWNSTREAM_CONNECTION_H
+
+#include "shrpx_downstream_connection.h"
+#include "template.h"
+
+using namespace nghttp2;
+
+namespace shrpx {
+
+class Worker;
+
+// If new method is added, don't forget to update API_METHOD_STRING as
+// well.
+enum APIMethod {
+  API_METHOD_GET,
+  API_METHOD_POST,
+  API_METHOD_PUT,
+  API_METHOD_MAX,
+};
+
+// API status code, which is independent from HTTP status code.  But
+// generally, 2xx code for SUCCESS, and otherwise FAILURE.
+enum class APIStatusCode {
+  SUCCESS,
+  FAILURE,
+};
+
+class APIDownstreamConnection;
+
+struct APIEndpoint {
+  // Endpoint path.  It must start with "/api/".
+  StringRef path;
+  // true if we evaluate request body.
+  bool require_body;
+  // Allowed methods.  This is bitwise OR of one or more of (1 <<
+  // APIMethod value).
+  uint8_t allowed_methods;
+  std::function<int(APIDownstreamConnection &)> handler;
+};
+
+class APIDownstreamConnection : public DownstreamConnection {
+public:
+  APIDownstreamConnection(Worker *worker);
+  virtual ~APIDownstreamConnection();
+  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 void on_upstream_change(Upstream *upstream);
+
+  // true if this object is poolable.
+  virtual bool poolable() const;
+
+  virtual const std::shared_ptr<DownstreamAddrGroup> &
+  get_downstream_addr_group() const;
+  virtual DownstreamAddr *get_addr() const;
+
+  int send_reply(unsigned int http_status, APIStatusCode api_status,
+                 const StringRef &data = StringRef{});
+  int error_method_not_allowed();
+
+  // Handles backendconfig API request.
+  int handle_backendconfig();
+  // Handles configrevision API request.
+  int handle_configrevision();
+
+private:
+  Worker *worker_;
+  // This points to the requested APIEndpoint struct.
+  const APIEndpoint *api_;
+  // The file descriptor for temporary file to store request body.
+  int fd_;
+  // true if we stop reading request body.
+  bool shutdown_read_;
+};
+
+} // namespace shrpx
+
+#endif // SHRPX_API_DOWNSTREAM_CONNECTION_H