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another option: you might be able to extract that to an extension method on `ApplicationCall` and use that:
```
fun ApplicationCall.requireSession(): DashSession? {
  val session = sessions.get&lt;DashSession&gt;()
  if (session == null) respondRedirect("/login")
  return session
}
```
use it like this:
```
val session = call.requireSession() ?: return@get
```

The only problem with that approach is that the respondRedirect doesn’t breaks the flow, so you still have to return the function later, and it is more error prone.
I have created a sample using `StatusPages` and exceptions here:

<https://github.com/ktorio/ktor-samples/blob/379b2e83146ed6ca9ad42bcc77bc2f346508bd1a/other/redirect-with-exception/src/RedirectWithExceptionApplication.kt>