Upgrade Header

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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.

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References

  1. MDN. “Upgrade header”. Available at: https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_request_header . (Accessed: [2025-05-13 Tue 18:55]). ↩︎

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