delegate.writeTo(sink)
  }

  override fun isDuplex(): Boolean = delegate.isDuplex()

  override fun toString(): String = javaClass.simpleName + "(" + delegate.toString() + ")"

  init {
    requireNotNull(delegate) { "delegate == null" }
    this.delegate = delegate
  }

  override fun source(): BufferedSource = delegate.source()

  override fun toString(): String = javaClass.simpleName + "(" + delegate.toString() + ")"

  init {
    requireNotNull(delegate) { "delegate == null" }
    this.delegate = delegate
  }

import java.net.URI

/**
 * A proxy selector that always returns the [Proxy.NO_PROXY].
 */
object NullProxySelector : ProxySelector() {
  override fun select(uri: URI?): List<Proxy> {
    requireNotNull(uri) { "uri must not be null" }
    return listOf(Proxy.NO_PROXY)
  }

  override fun connectFailed(
    uri: URI?,
    sa: SocketAddress?,
    ioe: IOException?,
  ) {
  }