Notes on CPDOS attack CDN

Sending malicious HTTP requests (including overside header, meta char, method override header) to CDNs endpoint 
--> these kind of requests are not detected by caching system, are processed by intermediate CDN caching system 
--> then forward to the origin server 
--> origin return server-generated error page 
--> CDN stored error page on edge 
--> CDN serves the same error for normal requests from end-user