func NewAWS(ipv6 bool) Environment {
	headers := requestHeaders(ipv6)

	return &awsEnv{
		region:           getRegion(ipv6, headers),
		availabilityZone: getAvailabilityZone(ipv6, headers),
		instanceID:       getInstanceID(ipv6, headers),
	}
}

func requestHeaders(ipv6 bool) map[string]string {
	// try to get token first, if it fails, fallback to IMDSv1

   *
   * @param streamId server-initiated stream ID: an even number.
   * @param requestHeaders minimally includes `:method`, `:scheme`, `:authority`,
   * and `:path`.
   */
  fun onRequest(
    streamId: Int,
    requestHeaders: List<Header>,
  ): Boolean

  /**
   * The response headers corresponding to a pushed request.  When [last] is true, there are

   *     Corresponds to `FLAG_FIN`.
   */
  @Throws(IOException::class)
  fun newStream(
    requestHeaders: List<Header>,
    out: Boolean,
  ): Http2Stream {
    return newStream(0, requestHeaders, out)
  }

  @Throws(IOException::class)
  private fun newStream(
    associatedStreamId: Int,
    requestHeaders: List<Header>,
    out: Boolean,
  ): Http2Stream {
    val outFinished = !out

import org.codelibs.fess.app.web.api.ApiResult.ApiUpdateResponse;
import org.codelibs.fess.app.web.api.ApiResult.Status;
import org.codelibs.fess.app.web.api.admin.FessApiAdminAction;
import org.codelibs.fess.es.config.exentity.RequestHeader;
import org.lastaflute.web.Execute;
import org.lastaflute.web.response.JsonResponse;

/**
 * @author Keiichi Watanabe
 */
public class ApiAdminReqheaderAction extends FessApiAdminAction {

    @Path("/reviews/{productId}")
    public Response bookReviewsById(@PathParam("productId") int productId, @Context HttpHeaders requestHeaders) {
      int starsReviewer1 = -1;
      int starsReviewer2 = -1;

      if (ratings_enabled) {
        JsonObject ratingsResponse = getRatings(Integer.toString(productId), requestHeaders);
        if (ratingsResponse != null) {
          if (ratingsResponse.containsKey("ratings")) {

        // request header
        final List<RequestHeader> requestHeaderList = requestHeaderService.getRequestHeaderList(getId());
        final List<org.codelibs.fess.crawler.client.http.RequestHeader> rhList = new ArrayList<>();
        for (final RequestHeader requestHeader : requestHeaderList) {
            rhList.add(requestHeader.getCrawlerRequestHeader());
        }

		data["requestheader-username-headers"], err = jsonSerializeStringSlice(authenticationInfo.RequestHeaderUsernameHeaders.Value())
		if err != nil {
			return nil, err
		}
		data["requestheader-group-headers"], err = jsonSerializeStringSlice(authenticationInfo.RequestHeaderGroupHeaders.Value())
		if err != nil {
			return nil, err
		}

						"destination_service_name": "istio-egressgateway",
						"response_code":            "200",
					},
				},
				StatusCode: http.StatusOK,
				Protocol:   "HTTP/1.1",
				RequestHeaders: map[string]string{
					// We inject this header in the VirtualService
					"Handled-By-Egress-Gateway": "true",
				},
			},
		},
		{
			Name:     "HTTP H2 Traffic Egress",
			PortName: "http",

      val requestHeaders = networkResponse!!.request.headers
      val responseHeaders = headers
      return varyHeaders(requestHeaders, responseHeaders)
    }

    /**
     * Returns the subset of the headers in [requestHeaders] that impact the content of the
     * response's body.
     */
    private fun varyHeaders(
      requestHeaders: Headers,
      responseHeaders: Headers,

				"x-envoy-decorator-operation",
			)

			checkNoProxyHeaders := check.Each(func(response echoClient.Response) error {
				for k, v := range response.RequestHeaders {
					hn := strings.ToLower(k)
					if allowedClientHeaders.Contains(hn) {
						// This is allowed
						continue
					}
					if proxyHeaders.Contains(hn) || strings.HasPrefix(hn, "x-") {