*
   * ```java
   * // ensure the response (and underlying response body) is closed
   * try (Response response = client.newCall(request).execute()) {
   *   ...
   * }
   * ```
   *
   * The caller may read the response body with the response's [Response.body] method. To avoid
   * leaking resources callers must [close the response body][ResponseBody] or the response.
   *

Wenn beispielsweise ein Code irgendwann in der Mitte, in einer anderen Abhängigkeit oder in einer *Pfadoperation*, ein „Rollback“ einer Datenbanktransaktion oder einen anderen Fehler verursacht, empfangen Sie die resultierende Exception in Ihrer Abhängigkeit.

Sie können also mit `except SomeException` diese bestimmte Exception innerhalb der Abhängigkeit handhaben.

Wenn Sie in Ihrem Browser eine URL wie:

```
http://127.0.0.1:8000/items/foo-item
```

... öffnen, ohne den benötigten Parameter `needy`, dann erhalten Sie einen Fehler wie den folgenden:

```JSON
{
  "detail": [
    {
      "type": "missing",
      "loc": [
        "query",
        "needy"
      ],
      "msg": "Field required",
      "input": null,

    connection.readerRunnable.applyAndAckSettings(true, settings)
    assertThat(connection.peerSettings[Settings.MAX_CONCURRENT_STREAMS]).isEqualTo(amount)
    taskFaker.runTasks()
  }

  /** Use a helper method so there's no hidden reference remaining on the stack.  */
  private fun allocateAndLeakAllocation(
    pool: ConnectionPool,
    connection: RealConnection,
  ) {
    val client =

# Header-Parameter

So wie `Query`-, `Path`-, und `Cookie`-Parameter können Sie auch <abbr title='Header – Kopfzeilen, Header, Header-Felder: Schlüssel-Wert-Metadaten, die vom Client beim Request, und vom Server bei der Response gesendet werden'>Header</abbr>-Parameter definieren.

## `Header` importieren

Importieren Sie zuerst `Header`:

=== "Python 3.10+"

    ```Python hl_lines="3"
    {!> ../../../docs_src/header_params/tutorial001_an_py310.py!}

  internal var lazyCacheControl: CacheControl? = null

  val isHttps: Boolean
    get() = url.isHttps

  /**
   * Constructs a new request.
   *
   * Use [Builder] for more fluent construction, including helper methods for various HTTP methods.
   *
   * @param method defaults to "GET" if [body] is null, and "POST" otherwise.
   */
  constructor(
    url: HttpUrl,
    headers: Headers = headersOf(),

            // the `invoke` member function. In this case, we use the `calleeExpression` in the `KtCallExpression` as the PSI
            // representation of this receiver. Caller can then use this PSI for further call resolution, which is implemented by the
            // parameter `resolveCalleeExpressionOfFunctionCall` in `toKtCallInfo`.
            var explicitReceiverPsi = when (psi) {

pkg testing, method (*F) Failed() bool
pkg testing, method (*F) Fatal(...interface{})
pkg testing, method (*F) Fatalf(string, ...interface{})
pkg testing, method (*F) Fuzz(interface{})
pkg testing, method (*F) Helper()
pkg testing, method (*F) Log(...interface{})
pkg testing, method (*F) Logf(string, ...interface{})
pkg testing, method (*F) Name() string
pkg testing, method (*F) Setenv(string, string)

<img src="/img/tutorial/path-params/image02.png">

Aynı şekilde, farklı diller için kod türetme araçları da dahil olmak üzere çok sayıda uyumlu araç bulunur.

## Pydantic

* `@app.post()`
* `@app.put()`
* `@app.delete()`

Tout comme celles les plus exotiques :

* `@app.options()`
* `@app.head()`
* `@app.patch()`
* `@app.trace()`

!!! tip "Astuce"
    Vous êtes libres d'utiliser chaque opération (méthode HTTP) comme vous le désirez.

    **FastAPI** n'impose pas de sens spécifique à chacune d'elle.