EndpointRouting - Catch All Endpoint for Custom 404 error messages

[shaif-dorIT]

Hi,

I started using F# and giraffe in order to learn Functional Programming.

I think that the title says it all, but I elaborate:

In regular route with the routex you can use regex route with "/*" to get catchall route.

How can I mimic that behavior in endpoint routing so I can get a custom handler for dealing with 404 in the endpoint list
that is needed in .UseEndpoints(fun e -> e.MapGiraffeEndpoints(endpoints))

[64J0]

Why don't you use the routex?

[esbenbjerre]

Why don't you use the routex?

It looks like routex isn't supported for the endpoint router.

The documentation does state the default and endpoint router can be used side by side, but I think it would be more elegant to add support for routex and/or adding a simple wildcard router function to the endpoint router.

[esbenbjerre]

After some searching I saw Giraffe maps route directly to IEndpointRouteBuilder.Map[Methods] so we can just use a catch-all route template.

let health: HttpHandler = setStatusCode StatusCodes.Status200OK >=> json {| Message = "OK" |}
let notFound: HttpHandler = setStatusCode StatusCodes.Status404NotFound >=> json {| Message = "Not found" |}

let endpoints =
  [
    GET [
      route "/health" health
    ]
    route "{*url}" notFound
  ]