* https://github.com/curl/curl/wiki/DNS-over-HTTPS
 */
object DohProviders {
  private fun buildGoogle(bootstrapClient: OkHttpClient): DnsOverHttps =
    DnsOverHttps
      .Builder()
      .client(bootstrapClient)
      .url("https://dns.google/dns-query".toHttpUrl())
      .bootstrapDnsHosts(getByIp("8.8.4.4"), getByIp("8.8.8.8"))
      .build()

  private fun buildGooglePost(bootstrapClient: OkHttpClient): DnsOverHttps =
    DnsOverHttps

    // flags

    private static final int FLAGS_CLOSE_AFTER_THIS_REQUEST = 0x01;
    private static final int FLAGS_CLOSE_IF_END_REACHED = 0x02;
    private static final int FLAGS_RETURN_RESUME_KEYS = 0x04;
    private static final int FLAGS_RESUME_FROM_PREVIOUS_END = 0x08;
    private static final int FLAGS_FIND_WITH_BACKUP_INTENT = 0x10;

    private static final int DEFAULT_LIST_SIZE = 65535;

import jakarta.servlet.http.HttpServletResponse;

public class CorsFilterTest extends UnitFessTestCase {

    private CorsFilter corsFilter;
    private TestCorsHandlerFactory corsHandlerFactory;
    private TestHttpServletRequest mockRequest;
    private TestHttpServletResponse mockResponse;
    private TestFilterChain mockFilterChain;

    @Override
    public void setUp() throws Exception {
        super.setUp();

      return new Iterator<T>() {
        private int index = biMap.firstInInsertionOrder;
        private int indexToRemove = ABSENT;
        private int expectedModCount = biMap.modCount;

        // Calls to setValue on inverse entries can move already-visited entries to the end.
        // Make sure we don't visit those.
        private int remaining = biMap.size;

        private void checkForComodification() {

    private IndexUpdateCallbackImpl indexUpdateCallback;
    private TestSystemHelper systemHelper;
    private TestIndexingHelper indexingHelper;
    private TestCrawlingInfoHelper crawlingInfoHelper;
    private TestSearchLogHelper searchLogHelper;
    private TestLabelTypeHelper labelTypeHelper;
    private TestLanguageHelper languageHelper;
    private TestSearchEngineClient searchEngineClient;

  }

  companion object {
    private const val CONNECTION = "connection"
    private const val HOST = "host"
    private const val KEEP_ALIVE = "keep-alive"
    private const val PROXY_CONNECTION = "proxy-connection"
    private const val TRANSFER_ENCODING = "transfer-encoding"
    private const val TE = "te"
    private const val ENCODING = "encoding"
    private const val UPGRADE = "upgrade"

    }

    Object writeReplace() {
      return new SerializedForm(charset);
    }

    private void readObject(ObjectInputStream stream) throws InvalidObjectException {
      throw new InvalidObjectException("Use SerializedForm");
    }

    private static final class SerializedForm implements Serializable {
      private final String charsetCanonicalName;

      SerializedForm(Charset charset) {

    }

    Object writeReplace() {
      return new SerializedForm(charset);
    }

    private void readObject(ObjectInputStream stream) throws InvalidObjectException {
      throw new InvalidObjectException("Use SerializedForm");
    }

    private static final class SerializedForm implements Serializable {
      private final String charsetCanonicalName;

      SerializedForm(Charset charset) {

    private static class TestBean {
        @CronExpression
        private String cronExpression;

        public String getCronExpression() {
            return cronExpression;
        }

        public void setCronExpression(String cronExpression) {
            this.cronExpression = cronExpression;
        }
    }

    private interface SpecialGroup {
    }

    return true
  }

  private fun requestIsOneShot(
    e: IOException,
    userRequest: Request,
  ): Boolean {
    val requestBody = userRequest.body
    return (requestBody != null && requestBody.isOneShot()) ||
      e is FileNotFoundException
  }

  private fun isRecoverable(
    e: IOException,
    requestSendStarted: Boolean,
  ): Boolean {