什么是Pragma Header?缓存页面. .和IE

So I am sending a header in php to cache my page (this integrates into our "CDN" (contendo/akamai) as well). I always use this pragma: cache header, I've seen various examples use it as well; however, I just checked fiddler to test traffic for this .net application we developed and it says: So I am sending a header in php to cache my pag