externalAddress, ok := r.RequestHeaders["X-Envoy-External-Address"]
						if !ok {
							return fmt.Errorf("missing X-Envoy-External-Address Header")
						}
						if err := ExpectString(externalAddress[0], "72.9.5.6", "envoy-external-address header"); err != nil {
							return err
						}
						xffHeader, ok := r.RequestHeaders["X-Forwarded-For"]
						if !ok {

    }
  }

  @Test
  fun requestHeaders() {
    server.enqueue(MockResponse())
    val request =
      Request.Builder()
        .url(server.url("/"))
        .addHeader("D", "e")
        .addHeader("D", "f")
        .build()
    assertThat(request.header("D")).isEqualTo("f")
    assertThat(request.header("d")).isEqualTo("f")
    val requestHeaders = request.headers