Вместо получения JSON, возращается код страницы:
Должно
{"ok":true,"result":{"message_id":23,"from":{"id":id,"is_bot":true,"first_name":"HN_bot","username":"HNSamp_Bot"},"chat":{"id":id,"first_name":"name","last_name":"name","username":"username","type":"private"},"date":date,"text":"text"}}...