Using Ajax with Cookies
https://developer.mozilla.org/en/http_access_control#Requests_with_credentials
You are using cross domain plus credentials. Then the server has to response with:
Access-Control-Allow-Origin: http://jsfiddle.net/msm595/9arFd/and not with:
Access-Control-Allow-Origin:*Wildcards are not allowed in this case.You may want to test with Chrome, it shows both headers and gave me this message:
XMLHttpRequest cannot load http://api.imgur.com/2/signin. Cannot use wildcard in Access-Control-Allow-Origin when credentials flag is true.`That's all I can say, imgur has to explicitly allow your JS solution. You may need a piece of code running on server's side not having cross domain issues.