Can't connect to ASP.NET server running on Raspberry Pi

Question

I'm trying to run a portable build of an ASP.NET application on .net 8 on a Raspberry Pi. I've got a Raspberry Pi 4 with the latest lite release of Raspberry Pi oS (Bookworm). And my publishing settings for the app are:

Delete existing files : false 
Configuration : Release
Target Framework : net8.0
Target runtime : Portable

The application starts and outputs this on the Pi:

info: Microsoft.Hosting.Lifetime[14]
      Now listening on: http://localhost:5000
info: Microsoft.Hosting.Lifetime[0]
      Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Hosting environment: Production
info: Microsoft.Hosting.Lifetime[0]
      Content root path: /home/pi/dotnet/lora_api

ApplicationSettings.json:

{
  "$schema": "http://json.schemastore.org/launchsettings.json",
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:21262",
      "sslPort": 0
    }
  },
  "profiles": {
    "http": {
      "commandName": "Project",
      "dotnetRunMessages": true,
      "launchBrowser": true,
      "launchUrl": "swagger",
      "applicationUrl": "http://localhost:5020",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "launchUrl": "swagger",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    }
  }
}

However, I get no response from localhost:5000 / (RaspiLocalAddress):5000 Am I missing anything?

Answer 1

@Pejda pointed out in their comment that Environment.IsDevelopment() is set whenever running under Visual Studio's development server or IIS. The default ASP.NET example for HTTP request API:s have apparently moved both the HTTP request pipeline and the development UI into an if-statment checking if the Environment.IsDevelopment() is set during the app builder. The solution is to move the service for the HTTP request pipeline outside of said if-statement. In my case, only the request service was needed and not the debugging UI that comes alongside so I left the UI inside the condition:

app.UseSwagger(); //Move this here
if (app.Environment.IsDevelopment())
{
    //app.UseSwagger was previously here
    app.UseSwaggerUI();
}