Fix websockets failing on Firefox #76
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Axum expected the `Connection` header to be _exactly_ `upgrade`. Turns out thats a bit too strict as this didn't work in Firefox. Turns out `Connection` just has to contain `upgrade`. At least that is what [warp does](https://github.com/seanmonstar/warp/blob/master/src/filters/ws.rs#L46).
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Axum expected the
Connectionheader to be exactlyupgrade. Turnsout thats a bit too strict as this didn't work in Firefox.
Turns out
Connectionjust has to containupgrade. At least that iswhat warp does.