X-Pass-Why

HTTP response header

The number tells the user how many times this version of a page has been served from the cache. A MISS indicates the page was not served from cache. The x-pass-why header will tell the user the reason why the request did not hit the cache.

Header usage statistics

X-Pass-Why response header information and usage statistics.
Websites using header X-Pass-Why50,376
Percentage of websites that use X-Pass-Why header<0.1%
Total discovered header values13
Header uses directivesNo
Header values are unique or randomNo
Most popular in the country United States

X-Pass-Why Directives

X-Pass-Why directives value information and usage statistics
DirectiveShareWebsites countUnique Values

Connected technologies

Technologies that utilize the header
WP Engine, category Web Hosting, total 439,641 websites

X-Pass-Why header usage distribution by website rank



Geographical Distribution

Header usage distribution by websites across the globe.



Websites utilizing X-Pass-Why

List of websites that use X-Pass-Why header
DomainCountryRankContacts
www.iab.com United States2,302
my.studiopress.com United States2,931
gigaom.com United States3,081
www.realtor.com United States3,773
www.campaignmonitor.com United States4,015
www.digitalcommerce360.com United States4,018
See full domain list

Common header values

List of top common X-Pass-Why header values
Header valueValue prevalence
custom-path34.78%
special path33.44%
wp-admin22.24%
pass-path3.07%
custom-cookie2.14%
logged-in2.13%
special cookie1.10%
special param0.58%
pass-cookie0.17%
wpe-cookie0.14%
custom-args0.14%
auth0.06%
Woo non-cached0.00%