Enabling GZIP with 1&1 IONOS
The GZip compression is now activated by default by WP Rocket on 1&1 IONOS hosting, you shouldn't need to use the php.ini file anymore.
If you are on a 1&1 hosting plan, GZIP compression may not be enabled by default. To enable, please follow their instructions here in reference to Activating Compression via php.ini with the following entries:
zlib.output_compression = 1 zlib.output_compression_level = 9