Does WebSockets work for hosted apps in ShinyApps.io?

[PerfIntell]

Apologies if I've missed documentation somewhere. When checking the network protos available WebSockets is always greyed out. The response to /info always has "WebSocket": false and we downgrade to xhr-streaming.

When running the shiny app locally in RStudio then WebSockets is fine.

There are a few bug reports regarding Connection headers and a few other ideas but are they relevant to the shinyapps.io saas?

Update: Using RStudio and rsconnect I see

rsconnect::showProperties(appPath = getwd(), appName = "xxxx", account = "xxxxxx")
application.connect.injection.version 62
application.shiny.timeout.session 3600
...
application.shiny.websockets FALSE

However I haven't seen this in the dashboard, nor can I edit the property...

rsconnect::setProperty("application.shiny.websockets", TRUE, appPath = getwd(), appName = "xxxx", account = "xxxxx")
Error: HTTP 400
PUT https://api.shinyapps.io/v1/applications/567113/properties/application.shiny.websockets?force=0
Unable to set read-only property.

Anyone know why this is disabled and seemingly uneditable?

[josh]

It is disabled because shinyapps.io does not support that protocol at this time. It is on our backlog, but we do not have an estimate for when support would be available.