Origin is not allowed by Access-Control-Allow-Origin.

[JosephineREgina]

I'm using  https://server.arcgisonline.com rest service in an application.But it shows the below error in the console.
XMLHttpRequest cannot load https://server.arcgisonline.com/ArcGIS/rest/info?f=json. Origin http://localhost:8080 is not allowed by A
ccess-Control-Allow-Origin.
I read various post but couldn't find a solution.
Can you provide a solution to fix this error?

[JeffPace]

the solution is to ignore it, or upgrade to CORS compatible servers

[derekswingley1]

We've discussed this quite a bit in the past, please read these threads:

http://forums.arcgis.com/threads/59988-Issue-Upgrading-to-version-3.0?p=207055&viewfull=1#post207055
http://forums.arcgis.com/threads/94219-Disable-CORS-Discussion