axum: fix panic caused by missing upgrade header; HTTP 400 on error #75
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Previously, this would lead to a panic:
curl 'http://127.0.0.1:3000' -H 'Sec-WebSocket-Version: 13' -H 'Sec-WebSocket-Key: hi' -i
Additionally, the implementation of
FromRequestParts
forIncomingUpgrade
now responds to errors with HTTP status400
instead of200
.