Function refused 

pub fn refused(
    status: StatusCode,
    placeholder: &str,
    error: &str,
    what: &str,
    extra: &str,
    next: &str,
) -> Response

A step that ended without what it was for: what happened, and next is what to do about it. error names the refusal in an attribute, for a tool reading the page. extra is markup set between the two.