constructor(response: Response) {
      this.url = response.request.url
      this.varyHeaders = response.varyHeaders()
      this.requestMethod = response.request.method
      this.protocol = response.protocol
      this.code = response.code
      this.message = response.message
      this.responseHeaders = response.headers
      this.handshake = response.handshake
      this.sentRequestMillis = response.sentRequestAtMillis