Method send_next_part

boost-http/http.cpp:287–313

  }

  void send_next_part() {
    if (writing_) {
      return;
    }

    if (!q_.empty()) {
      writing_ = true;
      auto buf = q_.front();

      asio::async_write(
          stream_, http::make_chunk(asio::buffer(*buf)),
          asio::bind_executor(strand_, [self = shared_from_this(), buf](beast::error_code error, std::size_t) {
            self->write_completed(std::move(error), WriteType::Chunk);
          }));

      return;
    }

    if (finished_) {
      writing_ = true;

      asio::async_write(stream_, http::make_chunk_last(),
                        asio::bind_executor(strand_, [self = shared_from_this()](beast::error_code error, std::size_t) {
                          self->write_completed(std::move(error), WriteType::Final);
                        }));
    }
  }

  void close() {
    beast::error_code error;