# Body - Fields

The same way you can declare additional validation and metadata in *path operation function* parameters with `Query`, `Path` and `Body`, you can declare validation and metadata inside of Pydantic models using Pydantic's `Field`.

## Import `Field`

First, you have to import it:

{* ../../docs_src/body_fields/tutorial001_an_py310.py hl[4] *}


/// warning

	}

	expected := []string{"Clusters Match", "Listeners Match", "Routes Match"}
	for _, exp := range expected {
		if !bytes.Contains(outputBuffer.Bytes(), []byte(exp)) {
			t.Errorf("Expected %s, but it was not found", exp)
		}
	}
}

// TestComparatorMismatchedConfigs tests the scenario where Istiod and Envoy configurations do not match
func TestComparatorMismatchedConfigs(t *testing.T) {

///

```Python hl_lines="10"
{!> ../../docs_src/dependencies/tutorial011.py!}
```

////

In diesem Fall ist dieses `__call__` das, was **FastAPI** verwendet, um nach zusätzlichen Parametern und Unterabhängigkeiten zu suchen, und das ist es auch, was später aufgerufen wird, um einen Wert an den Parameter in Ihrer *Pfadoperation-Funktion* zu übergeben.

## Die Instanz parametrisieren

  }

  fun connectionCount(): Int {
    return connections.size
  }

  /**
   * Attempts to acquire a recycled connection to [address] for [connectionUser]. Returns the connection if it
   * was acquired, or null if no connection was acquired. The acquired connection will also be
   * given to [connectionUser] who may (for example) assign it to a [RealCall.connection].
   *

        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          config: >
            {
              "answered": {
                "delay": 864000,
                "message": "Assuming the original need was handled, this will be automatically closed now. But feel free to add more comments or create new issues or PRs."
              },
              "waiting": {
                "delay": 2628000,

        .body("Body")
        .build(),
    )
    newWebSocket()
    clientListener.assertFailure(
      200,
      "Body",
      ProtocolException::class.java,
      "Expected HTTP 101 response but was '200 OK'",
    )
  }

  @Test
  @Throws(IOException::class)
  fun notFound() {
    webServer.enqueue(
      MockResponse.Builder()
        .status("HTTP/1.1 404 Not Found")
        .build(),

			if err = createConfig(kubeClient, wg, ctx.IstioNamespace(), clusterID, ingressIP, internalIP, externalIP, outputDir, cmd.OutOrStderr()); err != nil {
				return err
			}
			fmt.Printf("Configuration generation into directory %s was successful\n", outputDir)
			return nil
		},
		PreRunE: func(cmd *cobra.Command, args []string) error {
			if len(internalIP) > 0 && len(externalIP) > 0 {

	// DataDir of the file
	DataDir string `msg:"dd"`

	// Indicates if this object is still in V1 format.
	XLV1 bool `msg:"v1"`

	// Date and time when the file was last modified, if Deleted
	// is 'true' this value represents when while was deleted.
	ModTime time.Time `msg:"mt"`

	// Total file size.
	Size int64 `msg:"sz"`

	// File mode bits.
	Mode uint32 `msg:"m"`

   *
   * @param failedConnection an optional connection that was resulted in a failure. If the failure
   *     is recoverable, the connection's route may be recovered for the retry.
   */
  fun hasNext(failedConnection: RealConnection? = null): Boolean

  /**
   * Returns true if the host and port are unchanged from when this was created. This is used to

## API Request Parameters

### Token