Return the authority.
<include/boost/url/url_view_base.hpp>
pct_string_view
encoded_authority() const noexcept;
If present, this function returns a string representing the authority (which may be empty). Otherwise it returns an empty string. The returned string may contain percent escapes.
assert( url_view( "file://Network%20Drive/My%2DFiles" ).encoded_authority() == "Network%20Drive" );
authority = [ userinfo "@" ] host [ ":" port ]