text: def main(request, response):
      if request.method == "OPTIONS":
          response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
          response.headers.set(b"Access-Control-Allow-Headers", b"X-Test")
          response.status = 200
      elif request.method == "GET":
          response.headers.set(b"Access-Control-Allow-Origin", b"*")
          if request.headers.get(b"X-Test"):
              response.headers.set(b"Content-Type", b"text/plain")
              response.content = "PASS"
          else:
              response.status = 400
  