config load-balance compression

Use this command to configure compression options.

The following content types can be compressed:

• application/javascript
• application/soap+xml
• application/x-javascript
• application/xml
• text/css
• text/html
• text/javascript
• text/plain
• text/xml

Not all HTTP responses should be compressed. Compression offers the greatest performance improvements when applied to URLs whose media types compress well, such as repetitive text such as tagged HTML, and scripts such as JavaScript. Files that already contain efficient compression such as GIF images usually should not be compressed, as the CPU usage and time spent compressing them will result in an increased delay rather than network throughput improvement. Plain text files where no words are repeated, such as configurations with unique URLs or IPs, also may not be appropriate for compression.

Before you begin:

• You must have a good understanding of HTTP compression and knowledge of the content types served from the backend real servers.
• You must have read-write permission for load balancing settings.

Compression is not enabled by default. After you have configured a compression rule, you can select it in the profile configuration. To enable compression, select the profile when you configure the virtual server.

Syntax

config load-balance compression

edit <name>

set cpu-limit <integer>

set max-cpu-usage <integer>

set min-content-length <integer>

set uri-list-type {include | exclude>

config uri_list

edit <No.>

set uri <string>

next

end

config content_types

edit <No.>

set content-type {application/javascript | application/soap+xml | application/x-javascript | application/xml | text/css | text/html | text/javascript | text/plain | text/xml}

next

end

next

end

cpu-limit	Enable/disable application of a CPU limit.
max-cpu-usage	Maximum CPU usage for compression operations. The default is 80.
min-content-length	Do not compress files smaller than this size. The default is 1024 bytes.
uri-list-type	Specify whether to include or exclude items in the list from compression.
config uri_list
uri	Specify URIs to build a list or sites to include/exclude from compression. You can use regular expressions.
config content_type
content-type	application/javascript application/soap+xml application/x-javascript application/xml text/css text/html text/javascript text/plain text/xml

Example

FortiADC-VM (compression) # config load-balance compression

FortiADC-VM (compression) # edit lb-compression

Add new entry 'lb-compression' for node 1627

FortiADC-VM (lb-compression) # get

min-content-length : 1024

cpu-limit : enable

max-cpu-usage : 80

uri-list-type : exclude

FortiADC-VM (lb-compression) # set max-cpu-usage 50

FortiADC-VM (lb-compression) # end