htaccess redirects not working after a while

[Mattias Geniar]

> Here you have it:

You are not caching the protocol (http or https), which will lead to different caching results depending on the backend response.

As an example, have a look here: https://github.com/mattiasgeniar/varnish-6.0-configuration-templates/blob/master/default.vcl#L236-L238 

In your Apache proxy config you can set additional headers to mark they've been passed through it (in this example, X-Forwarded-Proto) so Varnish knows to treat them differently.

Mattias