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.
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Websites using header Upgrade | 7,689,226 |
Percentage of websites that use Upgrade header | 8.62% |
Total discovered header values | 139 |
Header uses directives | No |
Header values are unique or random | No |
Most popular in the country | United States |