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diff --git a/src/ceph/src/rgw/rgw_asio_client.h b/src/ceph/src/rgw/rgw_asio_client.h
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+++ b/src/ceph/src/rgw/rgw_asio_client.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+#ifndef RGW_ASIO_CLIENT_H
+#define RGW_ASIO_CLIENT_H
+
+#include <boost/asio/ip/tcp.hpp>
+#include <beast/http/message.hpp>
+#include <beast/http/message_parser.hpp>
+#include <beast/core/flat_streambuf.hpp>
+#include "include/assert.h"
+
+#include "rgw_client_io.h"
+
+namespace rgw {
+namespace asio {
+
+/// streaming message body interface
+struct streaming_body {
+  using value_type = boost::asio::mutable_buffer;
+
+  class reader {
+    value_type& buffer;
+   public:
+    using mutable_buffers_type = boost::asio::mutable_buffers_1;
+
+    static const bool is_direct{true}; // reads directly into user buffer
+
+    template<bool isRequest, class Fields>
+    explicit reader(beast::http::message<isRequest, streaming_body, Fields>& m)
+      : buffer(m.body)
+    {}
+
+    void init() {}
+    void init(uint64_t content_length) {}
+    void finish() {}
+
+    mutable_buffers_type prepare(size_t n) {
+      n = std::min(n, boost::asio::buffer_size(buffer));
+      auto position = boost::asio::buffer_cast<char*>(buffer);
+      return {position, n};
+    }
+
+    void commit(size_t n) {
+      buffer = buffer + n;
+    }
+  };
+};
+
+using header_type = beast::http::fields;
+using parser_type = beast::http::message_parser<true, streaming_body, header_type>;
+
+class ClientIO : public io::RestfulClient,
+                 public io::BuffererSink {
+ private:
+  using tcp = boost::asio::ip::tcp;
+  tcp::socket& socket;
+  parser_type& parser;
+  beast::flat_streambuf& buffer; //< parse buffer
+
+  bool conn_keepalive{false};
+  bool conn_close{false};
+  RGWEnv env;
+
+  rgw::io::StaticOutputBufferer<> txbuf;
+
+  size_t write_data(const char *buf, size_t len) override;
+  size_t read_data(char *buf, size_t max);
+
+ public:
+  ClientIO(tcp::socket& socket, parser_type& parser,
+           beast::flat_streambuf& buffer);
+  ~ClientIO() override;
+
+  bool get_conn_close() const { return conn_close; }
+
+  void init_env(CephContext *cct) override;
+  size_t complete_request() override;
+  void flush() override;
+  size_t send_status(int status, const char *status_name) override;
+  size_t send_100_continue() override;
+  size_t send_header(const boost::string_ref& name,
+                     const boost::string_ref& value) override;
+  size_t send_content_length(uint64_t len) override;
+  size_t complete_header() override;
+
+  size_t recv_body(char* buf, size_t max) override {
+    return read_data(buf, max);
+  }
+
+  size_t send_body(const char* buf, size_t len) override {
+    return write_data(buf, len);
+  }
+
+  RGWEnv& get_env() noexcept override {
+    return env;
+  }
+};
+
+} // namespace asio
+} // namespace rgw
+
+#endif // RGW_ASIO_CLIENT_H