function authimport { auth } from "https://deno.land/x/httpclient@0.0.1/mod.ts"; auth(headerKey?: string, tokenExtractor?: (r: any) => string | null): AuthMiddlewareAdd token based auth feature ParametersoptionalheaderKey: string = [UNSUPPORTED]optionaltokenExtractor: (r: any) => string | null = [UNSUPPORTED]ReturnsAuthMiddlewaremiddlware