Bad value cache-control for attribute http-equiv on element meta
html
Solution
HTML5 has very small set of values available for `http-equiv` attribute for `meta` property. It's not that you can take any possible HTTP header and use it this way. Although browser may and support many non-standard values, it's simply non spec-conformant.
Information here: http://www.w3.org/TR/html5/document-metadata.html#standard-metadata-names in p. 4.2.5.3 Pragma directives.
What you can probably do is - depending on used server technology - add those headers to HTTP response. How - this depends on whether your page is dynamically generated or is a static file. In the second case it depends on server software capabilities.
Problem
I dont want my HTML5 pages to be cached , so i am using these tags under my HTML file ``` <!DOCTYPE html> <head> <meta charset="utf-8"> <meta http-equiv="cache-control" content="max-age=0" /> <meta http-equiv="cache-control" content="no-cache" /> <meta http-equiv="expires" content="0" /> <meta http-equiv="expires" content="Tue, 01 Jan 1980 1:00:00 GMT" /> <meta http-equiv="pragma" content="no-cache" /> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <script src="js/jquery-1.10.2.min.js"></script> </head> ``` When i validated these with http://validator.w3.org/check , its saying as Bad value cache-control for attribute http-equiv on element meta. ``` <meta http-equiv="cache-control" content="max-age=0" /> ``` Bad value cache-control for attribute http-equiv on element meta. ``` <meta http-equiv="cache-control" content="no-cache" /> ``` Bad value expires for attribute http-equiv on element meta. ``` <meta http-equiv="expires" content="0" /> ``` Bad value expires for attribute http-equiv on element meta. ``` <meta http-equiv="expires" content="Tue, 01 Jan 1980 1:00:00 GMT" /> ``` Bad value pragma for attribute http-equiv on element meta. ``` <meta http-equiv="pragma" content="no-cache" /> ``` Could you please let me know how to resolve this ??