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Re:Whois on any .fr domain displays “je suis charlie” by cellover on Friday January 09, 2015 @10:44AM (#8862654)
Alternatively, more and more sysadmins have added custom headers to their web servers:

curl -I pilgrimbreak.com

  HTTP/1.1 301 Moved Permanently
  Server: nginx/1.6.2
  Date: Fri, 09 Jan 2015 15:39:36 GMT
  Content-Type: text/html
  Content-Length: 184
  Connection: keep-alive
  Location: http://www.pilgrimbreak.com/
  X-Charlie: I am Charlie
Re:Whois on any .fr domain displays “je suis charlie” by cellover on Monday January 12, 2015 @04:40AM (#8873068)
Spread the word if you manage an nginx server:

http://www.pilgrimbreak.com/nginx-custom-http-header/