HTTP response header

It allows an Edge Server (like Fastly�s caches) to "mix and match" content from multiple URLs. Fastly customers can use ESI to cache pages that contain both cacheable and uncacheable content (such as user-specific information).

Header usage statistics

X-Esi response header information and usage statistics.

Websites using header X-Esi 1,940
Percentage of websites that use X-Esi 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

Distribution by websites popularity

X-Esi detection in the top websites by popularity

Top 10k sites 16 websites
Top 100k sites 35 websites
Top 1m sites 186 websites

Websites utilizing X-Esi

List of websites that use X-Esi header

Domain Country Rank Contacts
www.wired.com United States of America 76
www.newyorker.com United States of America 233
www.vanityfair.com United States of America 323
www.vogue.in United States of America 651
pitchfork.com United States of America 896
www.gq.com United States of America 1,060
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-Esi header values

Header value Value prevalence
1 91.75%
true 4.12%
on 1.80%
YES 1.49%
4.01 0.21%
Do ESI = True 0.21%
0 0.15%
NO 0.10%
4.02 0.05%
Enabled 0.05%
page 0.05%