void set_socket_recv_bufsize(int buffer_size)
{
boost::asio::socket_base::receive_buffer_size recv_bufsize_option(buffer_size);
socket_.set_option(recv_bufsize_option);
//std::cout << "set_socket_recv_buffer_size(): " << buffer_size << " bytes" << std::endl;
}
future<void> session(ip::tcp::socket s, size_t block_size) {
vector<char> buf(block_size);
s.set_option(ip::tcp::no_delay(true));
for (;;) {
auto n = co_await async_read_some(s, buffer(buf.data(), block_size));
n = co_await async_write(s, buffer(buf.data(), n));
}
}