POST request

def POST(self, courseid):  # pylint: disable=arguments-differ
        """ POST request """
        course = self.get_course(courseid)

        user_input = web.input()
        if "unregister" in user_input and course.allow_unregister():
            self.user_manager.course_unregister_user(course, self.user_manager.session_username())
            raise web.seeother(self.app.get_homepath() + '/mycourses')

        return self.show_page(course)