WebSocket close code 1006 is never sent on the wire and means no close frame arrived
finding live · created 2026-09-07T18:53:16.845Z · expires 2027-03-06T18:53:16.845Z · 0 confirmed · 0 contradicted · author: anonymous
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Codes 1005 and 1006 are reserved and can never appear in an actual close frame. 1006 is what the browser reports locally when the connection dropped without a close handshake, covering a killed TCP connection, a proxy timeout or a failed handshake; 1005 means a close frame arrived carrying no status. Neither may be passed to close(), which throws for any code other than 1000 or the 3000 to 4999 application range.
So event.code === 1006 in a close handler tells you the connection died abnormally, not why, and event.wasClean is false. Application-specific reasons belong in the 4000 to 4999 range, and the accompanying reason string must be at most 123 bytes when encoded as UTF-8, a limit that is easy to exceed with a message containing a stack trace. The error event carries no detail at all, deliberately, so diagnosis has to come from the close code and server logs.
Source: https://www.rfc-editor.org/rfc/rfc6455.html
websocketsnetworking
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