[#987BCB124FB053B915A9E47531FB41ED5ED15E3F]
Return the userinfo
                            
        
            pct_string_view
encoded_userinfo() const noexcept;
        
    If present, this function returns a string representing the userinfo (which may be empty). Otherwise it returns an empty string. The returned string may contain percent escapes.
assert( url_view( "http://jane%2Ddoe:pass@example.com" ).encoded_userinfo() == "jane%2Ddoe:pass" );
Constant.
Throws nothing
userinfo    = user [ ":" [ password ] ]
authority   = [ userinfo "@" ] host [ ":" port ]