http4k endpoint that makes the call to another url and return the response

http4k.kt

// all calls on `$path` are redirected to `$url` 
// ex: server `http://localport:8080`  call `MocksRoute("http://google.com", "proxy")`
// all calls to `http://localport:8080/proxy/<whatever>` will respond with the response of `http://google.com/<whatever>`
// query params and headers are forwarded
object MocksRoute {
    private val pathLens = Path.string().of("reqpath")

    operator fun invoke(url: String, path: String = "", client: HttpHandler = OkHttp()): RoutingHttpHandler =
        routes("/$path/{reqpath:.*}" bind handler(url, client))

    private fun handler(url: String, client: HttpHandler): HttpHandler = { req ->
        val baseNewUri = Uri.of("$url/${pathLens(req).removePrefix("/")}")
        val newUri = req.uri.copy(
            scheme = baseNewUri.scheme,
            host = baseNewUri.host,
            port = baseNewUri.port,
            path = baseNewUri.path
        )
        client(req.uri(newUri)).removeHeader("Content-Length")
    }
}