Upgrade

HTTP response header

The Upgrade header field is an HTTP header field introduced in HTTP/1.1. In the exchange the client begins by making a cleartext request which is later upgraded to a newer HTTP protocol version or switched to a different protocol.

Header usage statistics

Upgrade response header information and usage statistics.

Websites using header Upgrade8,107,164
Percentage of websites that use Upgrade header8.50%
Total discovered header values135
Header uses directivesNo
Header values are unique or randomNo
Most popular in the country US

Upgrade Directives

Upgrade directives value information and usage statistics

DirectiveShareWebsites countUnique Values

Connected technologies

Technologies that utilize the header

HTTP/2, category Miscellaneous, total 8,106,851 websites

Distribution by websites popularity

Upgrade detection in the top websites by popularity

Top 10k sites246 websites
Top 100k sites3,636 websites
Top 1m sites69,213 websites

Websites utilizing Upgrade

List of websites that use Upgrade header

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Geographical Distribution

Header usage distribution by websites across the globe.






Common header values

List of top common Upgrade header values

Header valueValue prevalence
h2,h2c77.44%
h221.21%
h2c1.10%
h2c,h20.20%
h2,http:/1.10.03%
h2,h2c,http/10.00%
h2,HTTP,1.10.00%
h2,Http/1.10.00%
HTTP/1.10.00%
h2,h2c,http:/1.10.00%
acme-tls/10.00%
TLS/1.2, HTTP/1.10.00%
h2,http/1.00.00%
h2,http1.10.00%
h2,h2c,http/1.1​0.00%
h2,h2c,HTTP/1.10.00%
h2,hc20.00%
h2,h2c,http,/,1.10.00%
http:/1.10.00%
TLS/1.00.00%