Converts the integer to a known status-code.
Defined in header <beast/http/status.hpp>
If the integer does not match a known status code, http::unknown is returned.
Convenience header <beast/http.hpp>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)