Alternate-Protocol
HTTP response headerHeader 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% |