s.writeLong(sum());
  }

  private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException {
    s.defaultReadObject();
    busy = 0;
    cells = null;
    base = s.readLong();
  }

### Asynchronous Get ([.kt][AsynchronousGetKotlin], [.java][AsynchronousGetJava])

Download a file on a worker thread, and get called back when the response is readable. The callback is made after the response headers are ready. Reading the response body may still block. OkHttp doesn't currently offer asynchronous APIs to receive a response body in parts.

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient()

        assertEquals("mybucket", getField(conn, "bucketName"));
        // URL class does NOT normalize multiple slashes - they are preserved after removing leading slash
        String objectName = (String) getField(conn, "objectName");
        assertEquals("/path//to//object.txt", objectName);
    }

    /**

 * simplifies use of single-valued fields whose values routinely contain commas, such as cookies or
 * dates.
 *
 * This class trims whitespace from values. It never returns values with leading or trailing
 * whitespace.
 *
 * Instances of this class are immutable. Use [Builder] to create instances.
 */
@Suppress("NAME_SHADOWING")
class Headers internal constructor(

    frame.writeInt(expectedStreamId and 0x7fffffff)
    frame.writeAll(headerBlock)

    // Check writer sends the same bytes.
    assertThat(sendHeaderFrames(false, sentHeaders)).isEqualTo(frame)

    // Reading the above frames should result in a concatenated headerBlock.
    reader.nextFrame(
      requireSettings = false,
      object : BaseTestHandler() {
        override fun headers(
          inFinished: Boolean,

  private ExceptionTypePolicy policy = ExceptionTypePolicy.NPE_OR_UOE;

  /*
   * Requiring desugaring for guava-*testlib* is likely safe, at least for the reflection-based
   * NullPointerTester. But if you are a user who is reading this because this change caused you
   * trouble, please let us know: https://github.com/google/guava/issues/new
   */
  @IgnoreJRERequirement
  public NullPointerTester() {
    try {
      /*

       * use the `endpoint` field, compareTo() and endpoint(). Additionally, the main implementation
       * of Cut.compareTo checks for belowAll before reading accessing `endpoint` on another Cut
       * instance.
       */
      super("");
    }

    @Override
    Comparable<?> endpoint() {
      throw new IllegalStateException("range unbounded on this side");

     *
     * @return the response body as an InputStream, or null if no response body is available
     * @throws IORuntimeException if an I/O error occurs while reading the response body file
     */
    public InputStream getResponseBody() {
        if (responseBodyBytes != null) {
            return new ByteArrayInputStream(responseBodyBytes);
        }

        void testDecodeWithBufferOverflow() {
            assertThrows(SMBProtocolDecodingException.class, () -> testResponse.decode(testBuffer, 250, 10),
                    "Should throw exception when reading beyond buffer bounds");
        }

        @Test
        @DisplayName("Should handle zero-length decode")
        void testDecodeWithZeroLength() throws SMBProtocolDecodingException {

 *   ... // Handle the failure.
 *   }
 * });
 * ```
 *
 * These examples will not work if you're consuming the response body on another thread. In such
 * cases the consuming thread must call [close] when it has finished reading the response
 * body.
 *
 * ### The response body can be consumed only once.
 *
 * This class may be used to stream very large responses. For example, it is possible to use this