How Do I capture multiple lens errors in to single...

# http4k

[Anil]

How Do I capture multiple lens errors in to single response message. Ex:

private val sourceLens = Query.required("source")
    private val productIdLens = Query.optional("productId")
    private val countLens = <http://Query.int|Query.int>().required("count")

I have above three query parameters and I want to send a single response if all three params are missing