override fun <T : Any> tag(type: KClass<T>): T? = error("unexpected")

  override fun <T> tag(type: Class<out T>): T? = error("unexpected")

  override fun <T : Any> tag(
    type: KClass<T>,
    computeIfAbsent: () -> T,
  ): T = error("unexpected")

  override fun <T : Any> tag(
    type: Class<T>,
    computeIfAbsent: () -> T,
  ): T = error("unexpected")

 */
internal sealed class Tags {
  /**
   * Returns a tags instance that maps [key] to [value]. If [value] is null, this returns a tags
   * instance that does not have any mapping for [key].
   */
  abstract fun <T : Any> plus(
    key: KClass<T>,
    value: T?,
  ): Tags

  abstract operator fun <T : Any> get(key: KClass<T>): T?
}

   * val copy = original.clone()
   *
   * val myTag = original.tag(MyTag::class)
   * if (myTag != null) {
   *   copy.tag(MyTag::class) { myTag }
   * }
   * ```
   *
   * ```java
   * Call copy = original.clone();
   *
   * MyTag myTag = original.tag(MyTag.class);
   * if (myTag != null) {
   *   copy.tag(MyTag.class, () -> myTag);
   * }
   * ```
   *

### Eine benutzerdefinierte `GzipRequest`-Klasse erstellen { #create-a-custom-gziprequest-class }

/// tip | Tipp

Dies ist nur ein einfaches Beispiel, um zu demonstrieren, wie es funktioniert. Wenn Sie Gzip-Unterstützung benötigen, können Sie die bereitgestellte [`GzipMiddleware`](../advanced/middleware.md#gzipmiddleware) verwenden.

///

    }

    val expectedEvents = mutableListOf<KClass<out CallEvent>>()
    // Start out with standard events...
    expectedEvents += CallStart::class
    expectedEvents += ProxySelectStart::class
    expectedEvents += ProxySelectEnd::class
    expectedEvents += DnsStart::class
    expectedEvents += DnsEnd::class
    expectedEvents += ConnectStart::class
    if (https) {
      expectedEvents += SecureConnectStart::class

    assertThat(cacheEvents()).containsExactly(CacheMiss::class)

    result = cachedDns.lookup("google.com")
    assertThat(server.takeRequest(1, TimeUnit.MILLISECONDS)).isNull()
    assertThat(result).isEqualTo(listOf(address("157.240.1.18")))

    assertThat(cacheEvents()).containsExactly(CacheHit::class)

    result = cachedDns.lookup("www.google.com")

  @JvmName("reifiedTag")
  inline fun <reified T : Any> tag(): T? = tag(T::class)

  /** Returns the tag attached with [type] as a key, or null if no tag is attached with that key. */
  fun <T : Any> tag(type: KClass<T>): T? = type.java.cast(tags[type])

  /**
   * Returns the tag attached with `Object.class` as a key, or null if no tag is attached with
   * that key.
   *

  }

  override fun <T : Any> tag(type: KClass<T>): T? = type.java.cast(tags.get()[type])

  override fun <T> tag(type: Class<out T>): T? = tag(type.kotlin)

  override fun <T : Any> tag(
    type: KClass<T>,
    computeIfAbsent: () -> T,
  ): T = tags.computeIfAbsent(type, computeIfAbsent)

  override fun <T : Any> tag(
    type: Class<T>,
    computeIfAbsent: () -> T,

    val requestA = builder.tag(String::class, "a").build()
    val requestB = builder.tag(String::class, "b").build()
    val requestC = requestA.newBuilder().tag(String::class, "c").build()
    assertThat(requestA.tag(String::class)).isSameInstanceAs("a")
    assertThat(requestB.tag(String::class)).isSameInstanceAs("b")
    assertThat(requestC.tag(String::class)).isSameInstanceAs("c")
  }

  @Test

In diesem Fall können Sie den Dateipfad direkt von Ihrer *Pfadoperation*-Funktion zurückgeben.

## Benutzerdefinierte Response-Klasse { #custom-response-class }

Sie können Ihre eigene benutzerdefinierte Response-Klasse erstellen, die von `Response` erbt und diese verwendet.

Nehmen wir zum Beispiel an, dass Sie [`orjson`](https://github.com/ijl/orjson) mit einigen Einstellungen verwenden möchten.