*
   * <p>Usage example:
   *
   * <pre>{@code
   * // Falling back to a zero counter in case an exception happens when processing the RPC to fetch
   * // counters.
   * ListenableFuture<Integer> faultTolerantFuture =
   *     fetchCounters().catching(FetchException.class, x -> 0, directExecutor());
   * }</pre>
   *

  /**
   * The HTTP <a href="https://w3c.github.io/webappsec-fetch-metadata/">{@code Sec-Fetch-Site}</a>
   * header field name.
   *
   * @since 27.1
   */
  public static final String SEC_FETCH_SITE = "Sec-Fetch-Site";
  /**
   * The HTTP <a href="https://w3c.github.io/webappsec-fetch-metadata/">{@code Sec-Fetch-User}</a>
   * header field name.
   *
   * @since 27.1
   */