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-Overhead 63,215
Percentage of websites that use X-Clacks-Overhead header <0.1%
Total discovered header values 187
Header uses directives No
Header values are unique or random No
Most popular in the country United States of America

X-Clacks-Overhead Often Used Together:

Distribution by websites popularity

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

Top 10k sites 35 websites
Top 100k sites 167 websites
Top 1m sites 1,074 websites

Websites utilizing X-Clacks-Overhead

List of websites that use X-Clacks-Overhead header

Domain Country Rank Contacts
reddit.com United States of America 175
www.reddit.com United States of America 175
www.mozilla.org United States of America 178
tools.ietf.org United States of America 452
heise.de Germany 1,539
www.xml.com United States of America 1,567
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 value Value prevalence
GNU Terry Pratchett 96.03%
GNU Terry Pratchet 1.77%
GNU Natalie Nguyen 0.26%
GNU Romana Kitty, GNU Ben Grayman, GNU Michael Hofer, GNU Lincoln Kliman, GNU Larry Scharf 0.20%
GNU Terry Pratchett, Stephen Hawking 0.15%
GNU Terry Pratchett, Stephen Hawking, Prof. Dr. Georg Riccabona 0.15%
GNU ~abraxas 0.14%
GNU Terry Pratchett, Douglas Adams 0.14%
GNU Terry Pratchett, Paul Brown, Gaz Hunter 0.13%
"GNU Terry Pratchett" 0.10%
Terry Pratchett, Noirin Trouble Pluinceid, Dan Kaminsky 0.05%
GNU Terry Pratchett, Lester Haines 0.04%
GNU William Hartnell, Patrick Troughton, Jon Pertwee 0.04%
GNU Terry Pratchett, John TotalBiscuit Bain 0.03%
GNU Annemiek Lutz 0.03%
GNU Aaron Swartz 0.03%
GNU Terry Pratchett, Lloyd Barlowe 0.03%
GNU Terry Pratchett, Leonard Nimoy, Alan Rickman, B. B. King, David Bowie, Natalie Cole, Ben E. King, Ron Glass, Christopher Lee & Ian Fraser Kilmister 0.03%
GNU Terry Pratchett GNU Iain Banks 0.02%
GNU Terry Pratchett, GNU Iain Banks, GNU John Peel, GNU Simon Ricketts 0.02%