HTTP response header

Via header informs the client of proxies through which the response was sent

Header usage statistics

Via response header information and usage statistics.

Websites using header Via 2,321,077
Percentage of websites that use Via header 4.33%
Total discovered header values 42,876
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

Google Cloud, category Content Delivery Networks, total 2,140,470 websites
Varnish, category Cache Tools, total 1,163,782 websites
Amazon Cloudfront, category Content Delivery Networks, total 294,996 websites
Fastly, category Content Delivery Networks, total 185,845 websites
ATS, category Web Servers, total 71,603 websites
Vegur, category Reverse Proxy, total 68,259 websites
ALProxy, category Reverse Proxy, total 9,801 websites
Citrix ADC, category Network Devices, total 2,975 websites
Ipswitch-IMail, category Web Mail, total 37 websites

Distribution by websites popularity

Via detection in the top websites by popularity

Top 10k sites 2,412 websites
Top 100k sites 10,677 websites
Top 1m sites 75,521 websites

Websites utilizing Via

List of websites that use Via header

Domain Country Rank Contacts United States of America 21 United States of America 25 United States of America 26 United States of America 34 United States of America 35 United States of America 35
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 Via header values

Header value Value prevalence
1.1 google 32.27%
1.1 varnish (Varnish/6.6) 14.59%
1.1 varnish 13.93%
1.1 varnish, 1.1 varnish 4.32%
1.1 varnish (Varnish/6.0) 3.12%
1.1 vegur 2.94%
1.1 varnish-v4 2.54%
1.1 varnish (Varnish/5.0) 2.16%
varnish 0.95%
1.1 varnish (Varnish/5.2) 0.94%
1.1 varnish (Varnish/6.3), 1.1 varnish (Varnish/6.3) 0.92%
1.1 0.85%
1.1 varnish (Varnish/6.4) 0.83%
1.1 varnish (Varnish/5.1) 0.70%
1.1 varnish (Varnish/6.5) 0.64%
1.1 varnish (Varnish/6.1) 0.53%
1.1 alproxy 0.42%
1.1 varnish (Varnish/6.3) 0.21%
1.1 varnish (Varnish/6.2) 0.16%
global/140 0.12%