HTTP response header

Header usage statistics

Alternate-Protocol response header information and usage statistics.

Websites using header Alternate-Protocol 1,784
Percentage of websites that use Alternate-Protocol header <0.1%
Total discovered header values 26
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 1 websites
Top 100k sites 10 websites
Top 1m sites 77 websites

Websites utilizing Alternate-Protocol

List of websites that use Alternate-Protocol header

Domain Country Rank Contacts Russian Federation 9,338 Portugal 14,053 Portugal 14,053 United States of America 15,117 United States of America 33,086 United States of America 33,086
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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 43.39%
443:npn-spdy/2 23.82%
443:npn-spdy/3.1 12.78%
443:npn-spdy/4 6.11%
443:npn-http/2 4.09%
443:h2 1.91%
443:npn-http2/3 1.79%
443:npn-spdy/3,443:npn-spdy/2 1.40%
443:quic 1.35%
443:npn-http2/2 0.84%
443:npn-spdy/2, 443:spdy/2 0.62%
:npn-spdy/2 0.39%
443:npn-spdy/2,443:npn-spdy/3 0.34%
443:HTTP/2 0.17%
80:quic 0.17%
443:npn-h2 0.17%
443:spdy/3.1 0.11%
443:quic,p=1 0.11%
8080:quic 0.06%
443:http2/2 0.06%