OCSP stapling
Apache
<IfModule mod_ssl.c> SSLStaplingCache shmcb:/tmp/stapling_cache(128000) <VirtualHost *:443> [...] SSLUseStapling on </VirtualHost> </IfModule>
<IfModule mod_ssl.c> SSLStaplingCache shmcb:/tmp/stapling_cache(128000) <VirtualHost *:443> [...] SSLUseStapling on </VirtualHost> </IfModule>