When you create an ASP.NET Core application based on the webapp template like so:

dotnet new webapp

you get a simple web application as a result.

This is that simple application, ported to F#/Giraffe.

Here's what it looks like:

Going to:

https://localhost:5001/error

simulates a runtime exception:

Enter the following to run the app:

dotnet watch run

The code for the app is in Program.fs.