HTTP response header

Header usage statistics

Alternate-Protocol response header information and usage statistics.

Websites using header Alternate-Protocol 3,252
Percentage of websites that use Alternate-Protocol header <0.1%
Total discovered header values 29
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 15 websites
Top 1m sites 160 websites

Websites utilizing Alternate-Protocol

List of websites that use Alternate-Protocol header

Domain Country Rank Contacts United States of America 9,732 United States of America 20,556 United States of America 36,181 Germany 42,673 Germany 42,673 Germany 45,553
See full domain list
Flat price per the report, subscription is not required.

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 39.21%
443:npn-spdy/2 26.60%
443:npn-spdy/3.1 11.87%
443:npn-spdy/4 6.83%
443:npn-http/2 4.55%
443:h2 2.09%
443:npn-http2/3 2.06%
443:npn-spdy/3,443:npn-spdy/2 1.32%
443:quic 1.23%
443:npn-spdy/2, 443:spdy/2 1.23%
443:npn-http2/2 1.14%
443:npn-spdy/2,443:npn-spdy/3 0.40%
:npn-spdy/2 0.31%
80:quic 0.25%
443:quic,p=1 0.15%
443:npm-spdy/3 0.12%
443:spdy/3.1 0.09%
443:npn-h2 0.09%
443:HTTP/2 0.06%
443:npn-http22 0.06%