* **Modify some DNS records**.
    * For this, the renewal program needs to support the APIs of the DNS provider, so, depending on the DNS provider you are using, this might or might not be an option.
* **Run as a server** (at least during the certificate acquisition process) on the public IP address associated with the domain.
    * As we said above, only one process can be listening on a specific IP and port.

        rnd.nextBytes(left);
        byte[] right = left.clone();
        assertThat(comparator.compare(left, right)).isEqualTo(0);
        int i = rnd.nextInt(left.length);
        left[i] ^= (byte) (1 + rnd.nextInt(255));
        assertThat(comparator.compare(left, right)).isNotEqualTo(0);
        assertThat(UnsignedBytes.compare(left[i], right[i]) > 0)
            .isEqualTo(comparator.compare(left, right) > 0);
      }
    }
  }

                                                            data-dismiss="modal">
                                                        <la:message key="labels.crud_button_cancel"/>
                                                    </button>
                                                    <button type="submit" class="btn btn-outline-light"

                                                                data-dismiss="modal">
                                                            <la:message key="labels.crud_button_cancel"/>
                                                        </button>
                                                        <button type="submit" class="btn btn-outline-light"

                                                            data-dismiss="modal">
                                                        <la:message key="labels.crud_button_cancel"/>
                                                    </button>
                                                    <button type="submit" class="btn btn-outline-light"

The benefit of raising an exception over `return`ing a value will be more evident in the section about Dependencies and Security.

                                                    <div class="form-group row">
                                                        <label for="name" class="col-sm-3 text-sm-right col-form-label"><la:message
                                                                key="labels.storage_folder_name"/></label>
                                                        <div class="form-inline col-sm-9">

This includes, for example:

* Email notifications sent after performing an action:
    * As connecting to an email server and sending an email tends to be "slow" (several seconds), you can return the response right away and send the email notification in the background.
* Processing data:

                            <la:message key="labels.joblog_configuration"/>
                        </h1>
                    </div>
                    <div class="col-sm-6">
                        <ol class="breadcrumb float-sm-right">
                            <li class="breadcrumb-item active"><la:link href="/admin/joblog">
                                <la:message key="labels.joblog_link_list"/>
                            </la:link></li>

    INSTANCE;

    @Override
    public int compare(long[] left, long[] right) {
      int minLength = Math.min(left.length, right.length);
      for (int i = 0; i < minLength; i++) {
        int result = Longs.compare(left[i], right[i]);
        if (result != 0) {
          return result;
        }
      }
      return left.length - right.length;
    }

    @Override
    public String toString() {