python - 403 FORBIDDEN in django agon-rating

Question

I have 403 FORBIDDEN error in agon-ratings plugin when submit rating. I have read the doc. But csrf token exists in header:

Request Headersview source  
Accept  */*
Accept-Encoding gzip, deflate
Accept-Language en-US,en;q=0.5
Cache-Control   no-cache
Connection  keep-alive
Content-Length  22
Content-Type    application/x-www-form-urlencoded; charset=UTF-8
Cookie  csrftoken=6C7zHmrBufWbiYeTXwRkCWC9hDfdxGoW;    sessionid=4d6b6977721fcb97f6903d0aaab5e632
Host    localhost:8000
Pragma  no-cache
Referer http://localhost:8000/news/40/asdas/
User-Agent  Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:23.0) Gecko/20100101   Firefox/23.0
X-Requested-With    XMLHttpRequest

Any help with this issue will be appreciated. Thanks in advance