feat: make protocols updatable

[XadillaX]

In my scene, protocol should be updatable too. So this feature is inspired from UrlProvider.

[coveralls]

Coverage decreased (-0.3%) to 94.581% when pulling d00224c on XadillaX:protocols-provider into 05a2f7c on pladaria:master.

[XadillaX]

/ping @pladaria

[XadillaX]

/ping @pladaria

[bj00rn]

@pladaria @XadillaX can we get this merged?

Having Protocols updatable would be awesome. A strong (but hackish) use case for this is sending JWT token securely when establishing connection, since the this is the only header available in the websocket browder implementation

[Phil1216]

I was this close to coding up this feature myself. I too am using protocols for sending tokens.

[bj00rn]

Sad to see this library abandoned..

Partykit looks promising!

Here is a naive workaround i was using..

export default class Socket extends ReconnectingWebSocket {
    constructor(urlProvider, protocolsProvider) {
        /**
         * Workaround to authenticate websocket over Sec-Websocket-Protocol header
         * see issue at (https://github.com/whatwg/websockets/issues/16)
         * @class _WebSocket
         * @extends {WebSocket}
         */
        class _WebSocket extends WebSocket {
            constructor(url) {
                super(url, protocolsProvider())
            }
        }

        super(urlProvider, undefined, {
            WebSocket: _WebSocket,
        })
    }
}