Callback behavior changed with 0.2.2

[haakonbuer]

Hi, I just recently updated to shiny.router 0.2.2 and noticed that for some dashboards where data fetching takes 10-15 seconds behavior has changed. Previously I would see the root page while the data loads, but now I get the 404 page while data loads.

I modified the basic app.R example code in order to create a reproducible example, with the following two changes:

# Callbacks on the server side for
# the sample pages
root_callback <- function(input, output, session) {
  
  ds <- reactive({
    # Adding a 5 second wait
    Sys.sleep(5)
    data.frame(x = c(1, 2), y = c(3, 4))
  })
  
  output$table_one <- renderDataTable({
    ds()
  })
}

# Creates router. We provide routing path, a UI as
# well as a server-side callback for each page.
router <- make_router(
  route("/", root_page, root_callback),
  route("other", other_page, other_callback),
  route("third", third_page, NA),
  page_404 = page404("You opened non existing bookmark!")
)

Now when the app starts off, the 404 page displays for 5 seconds, then the root page appears. In the previous version the root page would show while the root_callback finishes.

Is this expected, or is there a way to get the previous behavior back?

Session info attached:

sessionInfo()
R version 3.6.3 (2020-02-29)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19042)

Matrix products: default

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                           LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] shiny.router_0.2.2 shiny_1.5.0       

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.4.6    digest_0.6.25   withr_2.2.0     later_1.0.0     mime_0.9        R6_2.4.1        xtable_1.8-4    jsonlite_1.6.1 
 [9] magrittr_1.5    rlang_0.4.11    promises_1.1.0  tools_3.6.3     httpuv_1.5.2    fastmap_1.0.1   compiler_3.6.3  htmltools_0.5.0