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-Why 3,201
Percentage of websites that use X-Pass-Why header <0.1%
Total discovered header values 11
Header uses directives No
Header values are unique or random No
Most popular in the country United States of America

Connected technologies

Technologies that utilize the header

WP Engine, category Platform as a Service, total 108,486 websites

Distribution by websites popularity

X-Pass-Why detection in the top websites by popularity

Top 10k sites 7 websites
Top 100k sites 42 websites
Top 1m sites 375 websites

Websites utilizing X-Pass-Why

List of websites that use X-Pass-Why header

Domain Country Rank Contacts
blogs.nvidia.com United States of America 1,778
3dprint.com United States of America 2,052
plumvillage.org United States of America 3,512
ryot.org United States of America 6,546
purple.com United States of America 6,811
erlc.com United States of America 7,925
See full domain list
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Geographical Distribution

Header usage distribution by websites across the globe.

Common header values

List of top common X-Pass-Why header values

Header value Value prevalence
custom-path 73.54%
logged-in 11.28%
custom-cookie 9.78%
special cookie 1.94%
wp-admin 1.41%
pass-cookie 1.34%
auth 0.34%
custom-args 0.25%
special path 0.06%
nevercache-ua 0.03%
wpe-cookie 0.03%