I have made a html file, but when I upload and test it, I notice that It has 0 "Leverage browser caching". I google-ed a few time how to fix it and found that misses something in browsers request. There writes then I need to add something like this
HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html
Main question is: I don't know where to add it ?