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 5,673
Percentage of websites that use X-Clacks-Overhead header <0.1%
Total discovered header values 82
Header uses directives No
Header values are unique or random No
Most popular in the country United States of America

Distribution by websites popularity

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

Top 10k sites 27 websites
Top 100k sites 112 websites
Top 1m sites 953 websites

Websites utilizing X-Clacks-Overhead

List of websites that use X-Clacks-Overhead header

Domain Country Rank Contacts
www.mozilla.org United States of America 158
tools.ietf.org United States of America 324
heise.de Germany 659
www.raspberrypi.org United States of America 717
librarything.com United States of America 927
www.librarything.com United States of America 927
See full domain list

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 93.42%
GNU Terry Pratchet 1.80%
GNU Natalie Nguyen 1.11%
GNU Romana Kitty, GNU Ben Grayman, GNU Michael Hofer, GNU Lincoln Kliman, GNU Larry Scharf 0.32%
GNU Terry Pratchett, Lester Haines 0.30%
GNU Terry Pratchett, Noirin Trouble Pluinceid 0.25%
"GNU Terry Pratchett" 0.19%
GNU Terry Pratchett, Leonard Nimoy, Aaron Swartz, Stephen Hawking, Natalie Nguyen, Heather Heyer 0.19%
GNU Terry Pratchett, Stephen Hawking 0.16%
GNU Terry Pratchett, Stephen Hawking, Prof. Dr. Georg Riccabona 0.16%
GNU Annemiek Lutz 0.09%
GNU Terry Pratchett, Frank Spychalski, Phill Handy, Robert Basic 0.09%
Terry Pratchett 0.09%
GNU Sir Terry Pratchett 0.09%
Esen Unur, Can Unur 0.07%
GNU Terry Pratchett Gaz Hunter 0.07%
GNU Terry Pratchett, BiL Douglas 0.07%
''GNU Terry Pratchett'' 0.05%
GNU Terry Pratchett, Leonard Nimoy, Alan Rickman, B. B. King, David Bowie, Natalie Cole, Ben E. King, Ron Glass, Christopher Lee & Ian Fraser Kilmister 0.05%
GNU Iain M. Banks 0.05%