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The Master Switch
OpenLiteSpeed’s default Gzip and Brotli Compression settings should be appropriate for most situations. The server level Enable Compression setting is a master switch, and is enabled by default. If you set it to
No, it will disable compression server-wide, overriding all virtual-host-level compression settings.
Server-Level Compression Configuration
- Compressible Types is a comma-separated list of MIME types that may be compressed. You may use wildcards for MIME types, for example,
text/*. You can put
!in front of a MIME type to exclude it. The order of the list is important if you use
!. A list like
text/*, !text/css, !text/jswill compress all text files except for CSS and JS. MIME type must be matched before compression is considered. It controls both static and dynamic content and mod_gzip.
- Dynamic GZIP compression control will be effective only if GZIP Compression is enabled.
- GZIP Compression level ranges from
- If you set the Brotli Compression Level (Static File) to
0, then Brotli is disabled at the server level.
- Use Min Static File Size to specify the smallest size static file for which the server will create a corresponding compressed file. Any files that fall below the threshold will not be compressed by the server during initial access. However, they will still be compressed dynamically via mod_gzip. Static files are compressed only once, so even the smallest of files would be better off generated once at initial access than dynamically generated at runtime via mod_gzip.
Virtual Host level Compression Configuration
You can control gzip compression and brotli compression separately at the virtual host level.