HTTP response header

X-Clacks-Overhead is a non-standardised HTTP header based upon the fictional work of the late great Sir Terry Pratchett. This plugin enables you to add the pre-requisite 'GNU Terry Pratchett' as well as other custom X-Clacks-Overhead headers to Craft.

Header usage statistics

X-Clacks-Overhead response header information and usage statistics.

Websites using header X-Clacks-Overhead58,581
Percentage of websites that use X-Clacks-Overhead header<0.1%
Total discovered header values207
Header uses directivesNo
Header values are unique or randomNo
Most popular in the country US

X-Clacks-Overhead Directives

X-Clacks-Overhead directives value information and usage statistics

DirectiveShareWebsites countUnique Values

Distribution by websites popularity

X-Clacks-Overhead detection in the top websites by popularity

Top 10k sites31 websites
Top 100k sites167 websites
Top 1m sites1,007 websites

Websites utilizing X-Clacks-Overhead

List of websites that use X-Clacks-Overhead header

www.mozilla.org US178
tools.ietf.org US452
heise.de DE1,539
www.xml.com US1,567
www.debian.org US1,797
docs.python.org US2,015
See full domain list
Flat price per the report, subscription is not required.

Geographical Distribution

Header usage distribution by websites across the globe.

Common header values

List of top common X-Clacks-Overhead header values

Header valueValue prevalence
GNU Terry Pratchett95.85%
GNU Terry Pratchet1.76%
GNU Natalie Nguyen0.28%
GNU Romana Kitty, GNU Ben Grayman, GNU Michael Hofer, GNU Lincoln Kliman, GNU Larry Scharf0.21%
GNU Terry Pratchett, Stephen Hawking, Prof. Dr. Georg Riccabona0.16%
GNU ~abraxas0.15%
GNU Terry Pratchett, Douglas Adams0.15%
GNU Terry Pratchett, Stephen Hawking0.14%
GNU Terry Pratchett, Paul Brown, Gaz Hunter0.14%
"GNU Terry Pratchett"0.12%
Terry Pratchett, Noirin Trouble Pluinceid, Dan Kaminsky0.05%
GNU Terry Pratchett, Lester Haines0.05%
GNU William Hartnell, Patrick Troughton, Jon Pertwee0.04%
GNU Terry Pratchett, John TotalBiscuit Bain0.04%
GNU Annemiek Lutz0.04%
GNU Terry Pratchett, Leonard Nimoy, Alan Rickman, B. B. King, David Bowie, Natalie Cole, Ben E. King, Ron Glass, Christopher Lee & Ian Fraser Kilmister0.03%
GNU Terry Pratchett GNU Iain Banks0.03%
GNU Terry Pratchett, GNU Iain Banks, GNU John Peel, GNU Simon Ricketts0.02%
GNU Sir Terry Pratchett0.02%
GNU Manfred Schwingenschloegl, Johnny Cash, Douglas Adams, Terry Pratchett, Stephen Hawking0.02%