Enable compression

In ISPmanager you can configure compression of a website static content which includes files that can be easily modified (images, music, video, etc.). As a rule, such files consume much space and slow down your website. To compress them open the WWW-domain edit form and enable the option Compression and set a Compression level. Learn more under the article Add a WWW-domain. The maximum compression level is 9. The minimum is 1. We recommend setting 5.

The ngx_http_gzip_module module is a filter that compresses a request with gzip, enabling to reduce data size. If the compression is enabled, the following information is added into the Nginx configuration file for the WWW-domain:

Nginx configuration file

gzip on;
gzip_comp_level <compression level>;
gzip_disable "msie6";
gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/javascript

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Details

gzip on — enable the gzip compression.

gzip_comp_level <compression level> — sets the compression level.

gzip_disable "msie6" — disables the gzip compression for requests with the “User-Agent” heading fields that match specified regular expressions. The special mask “msie6” corresponds to the “MSIE [4-6]\.” regular expression, but it is faster.

gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/javascript — sets the data type that will be compressed. “text/html” are always compressed.

Perform the following steps to modify a list of data types:

Add the following variable on every cluster node in the ISPmanager configuration file /usr/local/mgr5/etc/ispmgrnode.conf
ISPmanager configuration file
```
path nginx-gzip-types <data type>
```
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E.g.:
ISPmanager configuration file
```
path nginx-gzip-types text/plain text/css
```
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Restart the control panel

/usr/local/mgr5/sbin/mgrctl -m ispmgr exit

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To apply the changes to the existing WWW-domains go to Domains → WWW-domains → Edit and click Ok.

For more information about ngx_http_gzip_module please refer to the official website.