What is the Content Compare Tool?
Content Compare allows you to check if the HTTP request of a CDN resource is successful on all the possible CDN PoPs where it can be accessed. Go to http://debug.onappcdn.com/contentcompare, insert your CDN hostname together with a file, for example: cdn.abc.com/mypic.jpg
The result will tell you if the HTTP request is successful on all CDN PoPs (showing code 200). If it is not successful, for example, showing error code (400) on specific PoPs, kindly stop using that particular PoP to avoid users getting error page and inform CDN support to look into it.