# actix_web::http::header::SEC_WEBSOCKET_KEY - Rust
API documentation for the Rust `SEC_WEBSOCKET_KEY` constant in crate `actix_web`.
Keywords: rust, rustlang, rust-lang, SEC_WEBSOCKET_KEY

# [−] [src] Constant actix_web::http::header::SEC_WEBSOCKET_KEY

    pub const SEC_WEBSOCKET_KEY: HeaderName

The |Sec-WebSocket-Key| header field is used in the WebSocket opening handshake. It is sent from the client to the server to provide part of the information used by the server to prove that it received a valid WebSocket opening handshake. This helps ensure that the server does not accept connections from non-WebSocket clients (e.g., HTTP clients) that are being abused to send data to unsuspecting WebSocket servers.

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