XSS-Vulnerability/EN/Solution Tips
If it was reported, that your website is probably not sufficiently protected from XSS attacks:
1; mode=block
Code example of an .htaccess file on an Apache webserver.
# Turn on XSS prevention tools, activated by default in IE and Chrome Header set X-XSS-Protection "1; mode=block"
Here is an example of an .htaccess file which will set the Header Scanner to green. (.htaccess example)