* this client silently recovers from the following problems:
     *
     * * **Unreachable IP addresses.** If the URL's host has multiple IP addresses,
     *   failure to reach any individual IP address doesn't fail the overall request. This can
     *   increase availability of multi-homed services.
     *
     * * **Stale pooled connections.** The [ConnectionPool] reuses sockets

    return super.add(e);
  }

  /**
   * Inserts the specified element at the tail of this queue if it is possible to do so immediately
   * without exceeding the queue's capacity, returning {@code true} upon success and {@code false}
   * if this queue is full. This method is generally preferable to method {@link #add}, which can
   * fail to insert an element only by throwing an exception.
   *

    when both are applicable.
 *  Fix: Fail early when a port is out of range.
 *  Fix: Offer `Content-Length` headers for multipart request bodies.
 *  Fix: Throw `UnknownServiceException` if a cleartext connection is attempted
    when explicitly forbidden.
 *  Fix: Throw a `SSLPeerUnverifiedException` when host verification fails.
 *  Fix: MockWebServer explicitly closes sockets. (On some Android releases,

   * @throws IllegalStateException if the service {@linkplain State#FAILED fails}.
   * @since 15.0
   */
  @SuppressWarnings("GoodTime") // should accept a java.time.Duration
  void awaitTerminated(long timeout, TimeUnit unit) throws TimeoutException;

  /**
   * Returns the {@link Throwable} that caused this service to fail.
   *

    if (!done) {
      StringBuilder builder = new StringBuilder();
      for (StackTraceElement trace : thread.getStackTrace()) {
        builder.append("\tat ").append(trace).append('\n');
      }
      fail(builder.toString());
    }
  }

    if (!done) {
      StringBuilder builder = new StringBuilder();
      for (StackTraceElement trace : thread.getStackTrace()) {
        builder.append("\tat ").append(trace).append('\n');
      }
      fail(builder.toString());
    }
  }

    assertThat(bb).isEqualTo(expectedHashCode.bytes);
    assertEquals(expectedHashCode.asInt, hash.asInt());
    if (expectedHashCode.asLong == null) {
      try {
        hash.asLong();
        fail();
      } catch (IllegalStateException expected) {
      }
    } else {
      assertEquals(expectedHashCode.asLong.longValue(), hash.asLong());
    }

              }
              if (created) break;
              continue; // Slot is now non-empty
            }
          }
          collide = false;
        } else if (!wasUncontended) // CAS already known to fail
        wasUncontended = true; // Continue after rehash
        else if (a.cas(v = a.value, fn(v, x))) break;
        else if (n >= NCPU || cells != as) collide = false; // At max size or stale

    }

    @Test
    public void test_encodeUrl_empty_and_null() {
        assertEquals("", DocumentUtil.encodeUrl(""));
        try {
            DocumentUtil.encodeUrl(null);
            fail("Should throw NullPointerException");
        } catch (NullPointerException e) {
            // Expected
        }
    }

    @Test
    public void test_encodeUrl_unicode() {

    assertThat(bb).isEqualTo(expectedHashCode.bytes);
    assertEquals(expectedHashCode.asInt, hash.asInt());
    if (expectedHashCode.asLong == null) {
      try {
        hash.asLong();
        fail();
      } catch (IllegalStateException expected) {
      }
    } else {
      assertEquals(expectedHashCode.asLong.longValue(), hash.asLong());
    }