shiny-server | My personal Shiny server | Data Visualization library

I have packaged an R Shiny application in docker and deployed it to AWS ECS on a Fargate instance with an application load balancer whose listener holds the SSL certificate. I can see that the task is running and healthy, but when I go to the URL after some idle period, it takes a full 30 seconds to load (again, this is not from the instance startup/provisioning time since it is already up and healthy). I can then open up a new browser and go to the same link, and it will load immediately. What could be causing this? I'm honestly not even sure what to search.

Note: When I run the container locally, the app does take a few seconds to start, but that is only when the container initially starts. It runs very quickly after that initial startup time regardless of idle time. Therefore, I don't think it's shiny-server. The instances that I am referring to above are already running, and I would expect them to behave accordingly.

I read about load balancer idle timeout, but would that take 30 seconds to reconnect after it ends the connection? I'm not very experienced when it comes to the inner workings of web apps, but it seems unlikely. At the same time, it seems like increasing the idle timeout did help, but the behavior is kind of erratic so that might just be confirmation bias.

I can provide more details about the configuration if needed. I just hoped that someone might know what details I should share instead of sharing my entire Terraform directory.

I hope you are well.
I need your help please.
My own shiny-server app is similar to this app and I would like to add to mine a downloadButton at the top :

I am deploying a docker container using Google Cloud Run. The docker container contains a R shiny app. And after a while from viewing the app, I see in the Cloud Run logs, the following:

I am currently hosting a number of shiny apps on a shiny-server open source on a centos7 distro. All the apps were/are working fine but for one of the apps when I try to go to the url I get the following message:

This page isn't working did not receive any data. ERR_EMPTY_RESPONSE.

All the other shiny apps hosted on the same shiny server are working just fine. I checked /var/log/shiny-server and there is no log file for this App. As the other apps are working fine, I dont think its a port issue.

The only difference between other apps and this one is that it was used the most by its users. Is there some restriction/limit on shiny-server for runtime? I can't figure out what the problem is. The app runs fine on RStudio Server and if I copy it into a new directory in /srv/shiny-server/ with a different name, it also works fine.

I am not new to programming, but I am very new to R Shiny.

A web portal will be linking to my R Shiny app (the app will be deployed to a shiny-server in a docker container), and the web portal will be passing some query string parameters to my app - an auth0 token, aud value, and the auth0 url where I should validate the token.

What I want to happen is once my app starts up, it gets the query parameters from the query string, validates the token with the auth0 url, and check that the "aud" value matches what is in the validated token.

I also want catch any errors and show just a "403 Forbidden" text . Currently, I've been bashing my head around trying to get this to work, but because of my limited experience with R and shiny, I have very little that works in my code. Any thorough explanation of code solutions would be super helpful.

What I have so far

FYI - I am an absolute newbie when it comes to shiny apps, but I am trying to help a shiny app developer deploy their app using a docker container (also a newbie with docker but I've done a few of them so I understand what is going on).

I have a shiny app, being deployed on a shiny-server in a docker container. This shiny app is using auth0, and I am following this write up (https://github.com/curso-r/auth0) so that the _auth0.yml file will get its secrets from environment variables.

Problem lies in how to correctly setup those environment variables in the docker container so that my _auth0.yml file will be populated with their values? Any help would be greatly appreciated!

I have tried setting "ENV" in my Dockerfile,

I have a shinyApp running on cloud that runs for long (lots of computation taking about 25 minutes) leading to timeout. However, If I keep interacting with the page as the app runs (e.g. navigating the navbar or moving a slider..), timeout does not happen. A possible solution is to keep the web-socket active by updating a value on the current page every 5 seconds or so. I borrowed the idea here https://community.rstudio.com/t/keep-shiny-app-running-in-shiny-server-no-greying-out/27784/4.

Say that I have this code (which is modified from OpenStreetMaps autoplot error in RStudio Server and Shiny Server in R4.0.0):

I'm building a WebApp with a SQL DB as Backend. I'm Deploying the both parts on Azure, as Azure Webapp and SQL Server.

The SQL server is sercured with Azure AD (AAD). So only Users in a Group can access the DB.

So I'm trying to setup a workflow where the Webapp login the user and collect his Access token. And then uses the token to Query the SQL server.

I've registreted the App in AAD, where it is authorized to read the user ID and impersonate as the user.

I've the following code which is working local. But I can't get it to work deployed locally in a Docker Image.