Return the userinfo
<include/boost/url/url_view_base.hpp>
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" );
userinfo = user [ ":" [ password ] ]
authority = [ userinfo "@" ] host [ ":" port ]
has_password , has_userinfo , encoded_password , encoded_user , password , user , userinfo .