Alternate-Protocol

HTTP response header

Header usage statistics

Alternate-Protocol response header information and usage statistics.

Websites using header Alternate-Protocol 655
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 15 websites
Top 1m sites 101 websites

Websites utilizing Alternate-Protocol

List of websites that use Alternate-Protocol header

Domain Country Rank Contacts
socialblade.com United States of America 2,211
megastroy.com Russian Federation 9,338
razaoautomovel.com Portugal 14,053
www.razaoautomovel.com Portugal 14,053
www.coingecko.com United States of America 15,117
labtag.com 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 47.33%
443:npn-spdy/2 35.11%
443:npn-spdy/3.1 6.11%
443:npn-http/2 2.14%
443:npn-spdy/4 1.68%
443:npn-http2/3 1.53%
443:h2 1.07%
443:quic 1.07%
443:npn-spdy/2, 443:spdy/2 0.92%
443:npn-spdy/3,443:npn-spdy/2 0.92%
:npn-spdy/2 0.46%
443:npn-h2 0.31%
443:npn-http2/2 0.31%
80:quic 0.31%
2015:quic 0.15%
443:HTTP/2 0.15%
443:npn-spdy/2,443:npn-spdy/3 0.15%
443:quic,p=1 0.15%
443:spdy/3.1 0.15%