public void forgetIdentity(SubjectContext subjectContext) {
        if (WebUtils.isHttp(subjectContext)) {
            HttpServletRequest request = WebUtils.getHttpRequest(subjectContext);
            HttpServletResponse response = WebUtils.getHttpResponse(subjectContext);
            forgetIdentity(request, response);
        }
    }
Removes the 'rememberMe' cookie from the associated {@link WebSubjectContext}'s request/response pair.
<p/>
The {@code SubjectContext} instance is expected to be a {@link WebSubjectContext} instance with an HTTP
Request/Response pair.  If it is not a {@code WebSubjectContext} or that {@code WebSubjectContext} does not
have an HTTP Request/Response pair, this implementation does nothing.

@param subjectContext the contextual data, usually provided by a {@link Subject.Builder} implementation
web/src/main/java/org/apache/shiro/web/mgt/CookieRememberMeManager.java