Configuring HTTP Strict Transport Security for lighttpd

You need to edit lighttpd.conf file located in /etc/ directory:
$ sudo vi /etc/lighttpd/lighttpd.conf
For FreeBSD unix, enter:
$ sudo vi /usr/local/etc/lighttpd/lighttpd.conf
Add mod_setenv module:

server.modules += ( "mod_setenv" )

Syntax for HSTS

setenv.add-response-header = ( "Strict-Transport-Security" => "max-age=SECONDS"  )

Examples

Set Strict-Transport-Securit header i.e. push HSTS policy by sending the following HTTP response header from secure (HTTPS) websites:

# Set HSTS for six months including all subdomains
setenv.add-response-header = ( "Strict-Transport-Security" => "max-age=15768000; includeSubdomains"  )

The time is set six months (15768000 is in seconds). If you have multiple setenv.add-response-header, use the following syntax (note +=):

## Setting up two headers ###
setenv.add-response-header = ( "X-Whom" => "lighttpd-aws-us-east" )
setenv.add-response-header += ( "Strict-Transport-Security" => "max-age=15768000; includeSubdomains"  )

Save and close the file. Restart the lighttpd web-server as follows:
$ sudo systemctl restart lighttpd
OR
$ sudo service lighttpd restart
OR
$ sudo /usr/local/etc/rc.d/lighttpd restart

Verify HSTS working

Type the following curl command to see HTTP headers:
$ curl -I https://your-domain-name-here/
$ curl -I https://www.cyberciti.biz/
Sample outputs:

References:

• Strict-Transport-Security