When using the object-cache.php drop-in with multiple sites, users will see unexpected behaviour (such as being redirected to site A when they attempt to load site B).
To avoid this, one must define WP_CACHE_KEY_SALT in wp-config.php.
It would be very helpful to put this in the README.
Agreed. I ran into this when I installed the Redis Object Cache
By Till Krüss last night on a second site. I'm still googling this to figure out how to make it go away.
When using the object-cache.php drop-in with multiple sites, users will see unexpected behaviour (such as being redirected to site A when they attempt to load site B).
To avoid this, one must define
WP_CACHE_KEY_SALT
inwp-config.php
.It would be very helpful to put this in the README.