Running Shiny from a SageMaker notebook?

[tomsutch]

I would like to run a Shiny app from within an AWS SageMaker notebook and was wondering if this is possible.
It is possible to run other types of web app, eg TensorBoard.

I tried running a simple embedded Shiny app using this example -- the only change I made was to specify the port at the end:

library(shiny)
shinyApp(

  ui = fluidPage(
    selectInput("region", "Region:",
                choices = colnames(WorldPhones)),
    plotOutput("phonePlot")
  ),

  server = function(input, output) {
    output$phonePlot = renderPlot({
      barplot(WorldPhones[,input$region]*1000,
              ylab = "Number of Telephones", xlab = "Year")
    })
  },

  options = list(height = 500, port=3387)
)

I then tried to access the Shiny app in another browser tab via https://<my-notebook-instance-name>.notebook.eu-west-1.sagemaker.aws/proxy/3387/, using the same method to construct the URL as with TensorBoard. The selectInput did load, but the plot wasn't produced, and after 5 seconds the app greyed out.

(I verified that I was able to get the Shiny app running successfully on my local machine.)

For the avoidance of doubt, this is with a standard SageMaker notebook instance, running an R kernel. I don't have a RStudio Workbench licence.

Thanks for any insight you may have.