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About
The HTTP Upgrade request and response header can be used to upgrade an already-established client/ server connection to a different protocol (over the same transport protocol); for example it can be used by a client to upgrade a connection from HTTP/1.1 to HTTP/2, or an HTTP(S) connection to a WebSocket connection1.
Anki
Links
References
MDN. “Upgrade header”. Available at: https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_request_header. (Accessed: ). ↩︎