Getting quizzes from Moodle

I'm trying to get Moodle's quizzes as JSON. I've already tried http://desenvolvimento.imd.ufrn.br/qmmoodle/webservice/rest/server.php?wstoken=cf5a6639a4431341a40e7a75d8bb9cba&wsfunction=get_quizzes_by_course&moodlewsrestformat=json&course_id=2 To get all quizzes from a specific course. And http://desenvolvimento.imd.ufrn.br/qmmoodle/webservice/rest/server.php?wstoken=cf5a6639a4431341a40e7a75d8bb9cba&wsfunction=get_quiz&moodlewsrestformat=json&quiz_id=3 To get a specific quiz. I don't know what is wrong in my URL. Thanks.