Purging a single URL from the Admin Bar will now automatically preload that URL.
Headers set via PHP are now captured when creating cache files and served back with the response.
Added verbose logging when WP_DEBUG is defined as true. This can be filtered with solidwp/performance/log/level, by passing one of: debug, info, notice, warning, error, critical, alert, emergency.
Fixes
Do not load invalid configuration values, preventing the settings page from loading.
