HTTP response header

Tells downstream proxies how to match future request headers to decide whether the cached response can be used rather than requesting a fresh one from the origin server.

Header usage statistics

vary response header information and usage statistics.

Websites using header vary 244,802
Percentage of websites that use vary header 2.30%
Total discovered header values 356
Header uses directives Yes
Header values are unique or random No
Most popular in the country Canada

vary Directives (1 total)

  • *

vary Directives

vary directives value information and usage statistics

Directive Share Websites count Unique Values
* <0.1% 73 1

Connected technologies

Technologies that utilize the header

Fastly, category Content Delivery Networks, total 77,344 websites
Weebly, category Content Management System, total 49,812 websites
TownNews, category Miscellaneous, total 2,293 websites

Distribution by websites popularity

vary detection in the top websites by popularity

Top 10k sites 115 websites
Top 100k sites 551 websites
Top 1m sites 5,557 websites

Websites utilizing vary

List of websites that use vary header

Domain Country Rank Contacts United States of America 60 United States of America 110 Netherlands 161 United States of America 174 United States of America 316 United States of America 363
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 vary header values

Header value Value prevalence
User-Agent, 76.41%
User-Agent 11.52%
origin, 3.79%
Cookie 1.72%
Accept-Encoding 1.11%
Cookie, 0.34%
Accept-Encoding,Cookie 0.31%
Host 0.31%
X-Forwarded-Proto, 0.28%
Origin 0.27%
Cookie,User-Agent 0.27%
X-IPCountry, 0.26%
Accept 0.25%
X-Forwarded-Protocol, 0.23%
Accept-Encoding,User-Agent 0.21%
x-forwarded-proto 0.21%
Accept-Encoding, Cookie 0.20%
negotiate 0.19%
X-Forwarded-Protocol 0.17%
X-Forwarded-Proto,Accept-Encoding 0.14%