How to embed google groups in iframe in Shiny App?

I am trying to embed Google Group into my a Shiny App. But it doesnt show up. What's going wrong?

library(shiny)

ui <- fluidPage(
    titlePanel("Google Groups"), 
    htmlOutput("iframe")
)

server <- function(input, output) {
    output$iframe <- renderUI({
        src = "https://groups.google.com/forum/embed/?place=forum/shiny-discuss"
        tags$iframe(src=src, height=400, width=600, frameborder='no')
    })
}

shinyApp(ui, server)

OK. I figured it out myself. Important was to pass the parenturl correctly with JS. This seems to work.

library(shiny)
library(shinyjs)

jsCode = "shinyjs.getGG = function(){
            src='https://groups.google.com/forum/embed/?place=forum/shiny-discuss' +
            '&showsearch=true&showpopout=true&parenturl=' +
            encodeURIComponent(window.location.href);
            Shiny.setInputValue('ggroups_url',src); 
}"

ui <- fluidPage(
    useShinyjs(),  # Include shinyjs
    extendShinyjs(text=jsCode),    
    titlePanel("Google Groups"), 
    htmlOutput("iframe")
)

server <- function(input, output) {
    output$iframe <- renderUI({
        js$getGG()
        src = input$ggroups_url
        cat("src = ",src,"\n")
        tags$iframe(id="forum_embed", src=src, height=600, width='100%', frameborder='no')
    })
}

shinyApp(ui, server)

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I found another solution without javascript but constructing the parenturl using the session$clientData. Here it is:

library(shiny)

ui <- fluidPage(
    titlePanel("Google Groups"), 
    htmlOutput("iframe")
)

server <- function(input, output, session) {
    output$iframe <- renderUI({
        parenturl <- paste0(session$clientData$url_protocol,
                            "//",session$clientData$url_hostname,
                            ":",session$clientData$url_port,
                            session$clientData$url_pathname)
        src = paste0('https://groups.google.com/forum/embed/?place=forum/shiny-discuss',
                     '&showsearch=true&showpopout=true&parenturl=',parenturl)
        cat("src = ",src,"\n")
        tags$iframe(id="forum_embed", src=src, height=600, width='100%', frameborder='no')
    })
}

shinyApp(ui, server)