Da wir zum Beispiel im `Image`-Modell ein Feld `url` haben, können wir deklarieren, dass das eine Instanz von Pydantics `HttpUrl` sein soll, anstelle eines `str`:

//// tab | Python 3.10+

```Python hl_lines="2  8"
{!> ../../docs_src/body_nested_models/tutorial005_py310.py!}
```

////

//// tab | Python 3.9+

  server.enqueue(new MockResponse().setBody("yo dog"));

  // Start the server.
  server.start();

  // Ask the server for its URL. You'll need this to make HTTP requests.
  HttpUrl baseUrl = server.url("/v1/chat/");

  // Exercise your application code, which should make those HTTP requests.
  // Responses are returned in the same order that they are enqueued.
  Chat chat = new Chat(baseUrl);

  private lateinit var client: OkHttpClient
  private lateinit var rootCa: HeldCertificate
  private lateinit var certificate: HeldCertificate
  private val dns = FakeDns()
  private lateinit var url: HttpUrl
  private lateinit var serverIps: List<InetAddress>

  @BeforeEach
  fun setUp(server: MockWebServer) {
    this.server = server
    platform.assumeHttp2Support()
    platform.assumeNotBouncyCastle()
    rootCa =

    return Proxy(Proxy.Type.HTTP, address)
  }

  /**
   * Returns a URL for connecting to this server.
   *
   * @param path the request path, such as "/".
   */
  fun url(path: String): HttpUrl {
    return HttpUrl.Builder()
      .scheme(if (sslSocketFactory != null) "https" else "http")
      .host(hostName)
      .port(port)
      .build()
      .resolve(path)!!
  }

  /**

   * is configured with a single proxy, a proxy selector, or neither.
   *
   * @param url a URL with only the scheme, hostname, and port specified.
   */
  open fun proxySelectStart(
    call: Call,
    url: HttpUrl,
  ) {
  }

  /**
   * 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:

Por exemplo, no modelo `Image` nós temos um campo `url`, nós podemos declara-lo como um `HttpUrl` do Pydantic invés de como uma `str`:

```Python hl_lines="4  10"
{!../../docs_src/body_nested_models/tutorial005.py!}
```

👀 🌐 🎛 👆 ✔️, 🛒 🩺 <a href="https://docs.pydantic.dev/latest/concepts/types/" class="external-link" target="_blank">Pydantic 😍 🆎</a>. 👆 🔜 👀 🖼 ⏭ 📃.

🖼, `Image` 🏷 👥 ✔️ `url` 🏑, 👥 💪 📣 ⚫️ ↩️ `str`, Pydantic `HttpUrl`:

//// tab | 🐍 3️⃣.6️⃣ &amp; 🔛

```Python hl_lines="4  10"
{!> ../../docs_src/body_nested_models/tutorial005.py!}
```

////

//// tab | 🐍 3️⃣.9️⃣ &amp; 🔛

   * https://github.com/square/okhttp/issues/5770
   */
  @Test fun proxySelectorNotCalledForNullHost() {
    // The string '>' is okay in a hostname in HttpUrl, which does very light hostname validation.
    // It is not okay in URI, and so it's stripped and we get a URI with a null host.
    val bogusHostname = ">"
    val address =
      factory.newAddress(

import assertk.assertions.isNull
import assertk.assertions.isSameAs
import assertk.assertions.isTrue
import kotlin.test.Test
import kotlin.test.assertFailsWith
import okhttp3.Headers.Companion.headersOf
import okhttp3.HttpUrl.Companion.toHttpUrl
import okhttp3.RequestBody.Companion.toRequestBody

class RequestCommonTest {
  @Test
  fun constructorNormal() {
    val url = "https://example.com/".toHttpUrl()

  private lateinit var serverIpv4: MockWebServer
  private lateinit var serverIpv6: MockWebServer

  private val listener = RecordingEventListener()
  private lateinit var client: OkHttpClient
  private lateinit var url: HttpUrl

  /**
   * This is mutable and order matters. By default, it contains [IPv4, IPv6]. Tests may manipulate
   * it to prefer IPv6.
   */
  private var dnsResults = listOf<InetAddress>()

  @BeforeEach