Method on_read_payload

boost-http/http-client.cpp:141–165

  }

  void on_read_payload(beast::error_code error, std::size_t) {
    auto &b = parser_.get().body();

    std::size_t bytes = sizeof(body_buf_) - b.size;

    if (bytes > 0) {
      callback_->receive_payload_part(std::string(body_buf_, bytes), false);
    }

    if (error == http::error::need_buffer) {
      return read_payload();
    }

    if (error) {
      return fail("read_payload", error);
    }

    if (parser_.is_done()) {
      payload_completed_ = true;
      callback_->receive_payload_part("", true);
      return do_close();
    }

    read_payload();
  }

  void do_close() {
    beast::error_code error;