Return the user
<include/boost/url/url_view_base.hpp>
pct_string_view
encoded_user() const noexcept;
If present, this function returns a string representing the user (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_user() == "jane%2Ddoe" );
userinfo = user [ ":" [ password ] ]
user = *( unreserved / pct-encoded / sub-delims )
password = *( unreserved / pct-encoded / sub-delims / ":" )
has_password , has_userinfo , encoded_password , encoded_userinfo , password , user , userinfo .