Disable non-websocket transports for Blazor Server

[danroth27]

Customers often have a bad time if they use Blazor Server with transports other than websockets. We should consider disabling non-websocket based transports for Blazor Server apps and provide a good error experience when websockets are not available.

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[pranavkm]

FYI @BrennanConroy / @davidfowl

[BrennanConroy]

We should consider disabling non-websocket based transports

If you do this you need to make sure that there is a way to opt back into other transports. You don't want to exclude those customers that can't run WebSockets for whatever reason.

Do you have ideas of how to surface clean errors for this or is there asks for SignalR to help here?

[danroth27]

Some evidence of Blazor Server usage over non-websockets: https://twitter.com/HeyWellsy/status/1408275567489601540

[TanayParikh]

provide a good error experience when websockets are not available.

@danroth27 Did you have anything in mind to ensure a 'good error experience'? Would a banner with a message like the following be appropriate?

@javiercn

[javiercn]

@TanayParikh can you detect that the websocket failed to connect?