HTTP response header

Header usage statistics

Alternate-Protocol response header information and usage statistics.

Websites using header Alternate-Protocol 618
Percentage of websites that use Alternate-Protocol header <0.1%
Total discovered header values 19
Header uses directives No
Header values are unique or random No
Most popular in the country United States of America

Distribution by websites popularity

Alternate-Protocol detection in the top websites by popularity

Top 10k sites 2 websites
Top 100k sites 13 websites
Top 1m sites 96 websites

Websites utilizing Alternate-Protocol

List of websites that use Alternate-Protocol header

Domain Country Rank Contacts United States of America 2,211 Russian Federation 9,338 Portugal 14,053 Portugal 14,053 United States of America 15,117 United States of America 33,086
See full domain list

Geographical Distribution

Header usage distribution by websites across the globe.

Common header values

List of top common Alternate-Protocol header values

Header value Value prevalence
443:npn-spdy/3 44.98%
443:npn-spdy/2 36.08%
443:npn-spdy/3.1 7.12%
443:npn-http/2 2.43%
443:npn-http2/3 1.62%
443:npn-spdy/4 1.62%
443:h2 0.97%
443:npn-spdy/2, 443:spdy/2 0.97%
443:quic 0.97%
443:npn-spdy/3,443:npn-spdy/2 0.81%
:npn-spdy/2 0.49%
443:npn-http2/2 0.49%
443:npn-h2 0.32%
80:quic 0.32%
2015:quic 0.16%
443:HTTP/2 0.16%
443:npn-spdy/2,443:npn-spdy/3 0.16%
443:quic,p=1 0.16%
443:spdy/3.1 0.16%