http4k / org.http4k.lens / multipartForm
fun Body.Companion.multipartForm(validator: Validator, vararg parts: Lens<MultipartForm, *>, defaultBoundary: String = MULTIPART_BOUNDARY, diskThreshold: Int = DEFAULT_DISK_THRESHOLD, contentTypeFn: (String) -> ContentType = ::MultipartFormWithBoundary): BiDiBodyLensSpec<MultipartForm>