Constant Upgrade
"Upgrade" header of current request.
Comma-separated list of additional communication protocols the client supports and is willing to use, if it is appropriate for the server to switch. A protocol switch response 101 must be sent by the server to switch protocols.
Namespace: Core\Env\Server\HTTP
Package: Core\Env\Server\HTTP
Link: RFC 2616: HTTP/1.1, Section 14: Header Field Definitions
Since: 3.1
Located at Env.inc.php
Package: Core\Env\Server\HTTP
Link: RFC 2616: HTTP/1.1, Section 14: Header Field Definitions
Since: 3.1
Located at Env.inc.php
Value summary
string |
'HTTP_UPGRADE' |