* including dots after the first colon. It matches IPv4 addresses as strings containing only
 * decimal digits and dots. This pattern matches strings like "a:.23" and "54" that are neither IP
 * addresses nor hostnames; they will be verified as IP addresses (which is a more strict
 * verification).
 */
private val VERIFY_AS_IP_ADDRESS = "([0-9a-fA-F]*:[0-9a-fA-F:.]*)|([\\d.]+)".toRegex()

      }
    }
  }

  @Throws(IOException::class)
  fun flush() {
    writer.flush()
  }

  /**
   * Degrades this connection such that new streams can neither be created locally, nor accepted
   * from the remote peer. Existing streams are not impacted. This is intended to permit an endpoint
   * to gracefully stop accepting new requests without harming previously established streams.
   */

This update fixes problems in 2.0.0-RC1. Read the 2.0.0-RC1 changes for
advice on upgrading from 1.x to 2.x.

 *  Fix: Don't leak connections! There was a regression in 2.0.0-RC1 where
    connections were neither closed nor pooled.
 *  Fix: Revert builder-style return types from OkHttpClient's timeout methods
    for binary compatibility with OkHttp 1.x.
 *  Fix: Don't skip client stream 1 on SPDY/3.1. This fixes SPDY connectivity to

   * Invoked after proxy selection.
   *
   * Note that the list of proxies is never null, but it may be a list containing
   * only [Proxy.NO_PROXY]. This comes up in several situations:
   *
   * * If neither a proxy nor proxy selector is configured.
   * * If the proxy is configured explicitly as [Proxy.NO_PROXY].
   * * If the proxy selector returns only [Proxy.NO_PROXY].
   * * If the proxy selector returns an empty list or null.
   *

    }.also { expected ->
      assertThat(expected.message).isEqualTo("PROTOCOL_ERROR: TYPE_DATA streamId == 0")
    }
  }

  /** We do not send SETTINGS_COMPRESS_DATA = 1, nor want to. Let's make sure we error.  */
  @Test fun compressedDataFrameWhenSettingDisabled() {
    val expectedData = ByteArray(Http2.INITIAL_MAX_FRAME_SIZE)
    Arrays.fill(expectedData, 2.toByte())

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