if (new_start != read_buffer_.begin()) {

input_range input =

boost::make_iterator_range(new_start, read_buffer_.end());

buffer_type::iterator start_tmp = new_start;

new_start = read_buffer_.begin();

thread_pool().post(

boost::bind(callback, input,boost::system::error_code(),

std::distance(new_start, data_end),

std::distance(start_tmp, data_end),

async_connection<Tag, Handler>::shared_from_this()));

new_start = read_buffer_.begin();

return;

}