Browser downloads file when opening a page
When trying to visit pages on your website, instead of the page opening normally, you get a popup asking you to download a file.
On Firefox it looks like this:
On Chrome, you will be prompted to open a file named: Download
We do not yet know the exact cause of the problem. We have seen this issue more often on LiteSpeed and OpenLiteSpeed servers than others.
The server seems to be setting the mime type of the GZIP-ed HTML cache file to
application/octet-stream. This kind of file cannot be opened in a browser and therefore the download is prompted.
We have found that it is often related to a conflict with the htaccess rules.
The quick fix is to install this helper plugin which removes all the htaccess rules. WP Rocket will still function correctly.
If you want to isolate the specific block of rules causing the issue, you can use the process of elimination described here.
If this solution does not work for your site, it means the issue is related to how the server is configured to handle
_gzip files. In this case you will have to contact your host to resolve it.