}

    @Synchronized override fun onRequest(
      streamId: Int,
      requestHeaders: List<Header>,
    ): Boolean {
      assertThat(streamId).isEqualTo(2)
      events.add(requestHeaders)
      notifyAll()
      return false
    }

    @Synchronized override fun onHeaders(
      streamId: Int,
      responseHeaders: List<Header>,
      last: Boolean,
    ): Boolean {

   * using a {@code LinkedHashSet} instead, at the cost of increased memory footprint, to get
   * deterministic iteration behavior.
   *
   * <p><b>Note:</b> this method is now unnecessary and should be treated as deprecated. Instead,
   * use the {@code HashSet} constructor directly, taking advantage of <a
   * href="https://docs.oracle.com/javase/tutorial/java/generics/genTypeInference.html#type-inference-instantiation">"diamond"

   * which it is unnecessary to programmatically distinguish between exception types or to extract
   * other information from the exception instance.
   *
   * <p>Exceptions from {@code Future.get} are treated as follows:
   *
   * <ul>
   *   <li>Any {@link ExecutionException} has its <i>cause</i> wrapped in an {@code X} if the cause

     * input before using it in LDAP search filters to prevent LDAP injection vulnerabilities.
     *
     * @param filter the LDAP search filter to escape (null is treated as empty string)
     * @return the escaped filter string safe for use in LDAP queries (empty string if filter is null)