Disable browser cache
You must send the HTTP header in the minimal set of instructions to disable the browser cache. The most important are:
Cache-Control: no-cache, no-store, must-revalidate Pragma: no-cache Expires: 0
Where in particular the three instructions indicate:
- HTTP 1.1 Cache-Control:
- Pragma: for HTTP 1.0
- Exprires: for proxies
These instructions can be given in several ways.
Browser cache control
Web pages (HTML)
Must be entered in the<HEAD>just after the opening<TITLE>:</TITLE></HEAD>
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate"> <meta http-equiv="Pragma" content="no-cache"> <meta http-equiv="Expires" content="0">
Apache haccess.
<IfModule mod_headers.c=""></IfModule> Header set Cache-Control "no-store, no-cache, must-revalidate" Header set Pragma no-cache directive Header set Expires 0
PHP
header (' Cache-Control: no-Cache, no-store, must-revalidate ');
header (' Pragma: no-cache ');
header (' Expires: 0 ');
RFC references
https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9
