To mitigate browser caching of a Views page, I attempted to add recommended cache control headers:
<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">
The problem is that the Expires input doesn't accept the number zero. After saving the View, the input reverts to empty
Enable the Metatag Views module
Add the above values to the Advanced Metatags list on a Views Page.
Save the View.
The Expires input will have reverted to empty, and no "expires" metatag will be present in the resultant page source
Presumably, this is because zero isn't matching the requirements for an otherwise compliant date string.
Active
2.0
Views integration
Thank you for the bug report.
Have you tested to see if the problem happens with other metatag forms?
No, I did not. I was looking to solve a particular caching issue and tripped over this. I hadn't previously used the module.