Accessing custom HTTP headers within the Shiny App

The request from Nginx lands an authentication module first and then later goes to the Shiny App. In the authentication module, I want to set an additional header and access that header within the Shiny App. I'm printing all the info contained in the session$request here.

server <- function(input, output, session) {

  output$summary <- renderText({

I see some of the headers like HTTP_CONNECTION , HTTP_HOST etc getting printed here, however I'm not seeing the custom header that I had set in the authentication module here. Does Shiny Server support accessing the custom http headers also or is there some restrictions on the headers that are available in session$request ?

Saw from the documentation that the headers need to be whitelisted and this feature is available only in the professional edition. Section 4.10 in this link -

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