```Python hl_lines="6-7"
{!../../docs_src/path_params/tutorial001.py!}
```

Der Wert des Pfad-Parameters `item_id` wird Ihrer Funktion als das Argument `item_id` übergeben.

Wenn Sie dieses Beispiel ausführen und auf <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a> gehen, sehen Sie als Response:

```JSON

///

Agora rode o _servidor ao vivo_ para as documentações em Espanhol:

<div class="termy">

```console
// Use o comando "live" e passe o código da linguagem como um argumento de linha de comando
$ python ./scripts/docs.py live es

<span style="color: green;">[INFO]</span> Serving on http://127.0.0.1:8008
<span style="color: green;">[INFO]</span> Start watching changes

	objectAPI, cred := validateAdminReq(ctx, w, r,
		policy.ListGroupsAdminAction, policy.ListUsersAdminAction, policy.ListUserPoliciesAdminAction)
	if objectAPI == nil {
		return
	}

	// Validate API arguments.

	q := madmin.PolicyEntitiesQuery{
		Users:  r.Form["user"],
		Groups: r.Form["group"],
		Policy: r.Form["policy"],
	}

	// Query IAM

	res, err := globalIAMSys.QueryLDAPPolicyEntities(r.Context(), q)

import org.apache.maven.api.annotations.Nonnull;

/**
 * Represents the base options supported by Maven tools.
 * This interface defines methods to access various configuration options
 * that can be set through command-line arguments or configuration files.
 *
 * @since 4.0.0
 */
@Experimental
public interface Options {
    /** Constant indicating that the options source is the command-line interface. */
    String SOURCE_CLI = "CLI";

}

const minReadBufferSize = 16
const maxConsecutiveEmptyReads = 100

// NewReaderSize returns a new [Reader] whose buffer has at least the specified
// size. If the argument io.Reader is already a [Reader] with large enough
// size, it returns the underlying [Reader].
func NewReaderSize(rd io.Reader, size int) *Reader {
	// Is it already a Reader?
	b, ok := rd.(*Reader)

	if ns1 != ns2 {
		return fmt.Errorf("Expected number of endpoints %d, seen %d", ns1, ns2)
	}

	for i, cmdLine := range s1.CmdLines {
		if cmdLine != s2.CmdLines[i] {
			return fmt.Errorf("Expected command line argument %s, seen %s", cmdLine,
				s2.CmdLines[i])
		}
	}

	if reflect.DeepEqual(s1.MinioEnv, s2.MinioEnv) {
		return nil
	}

	// Report differences in environment variables.
	var missing []string

     * on an SMB server addressed by the <code>SmbFile</code> parameter. See
     * {@link jcifs.smb.SmbFile} for a detailed description and examples of
     * the smb URL syntax. If the second argument is <code>true</code>, then
     * bytes will be written to the end of the file rather than the beginning.
     * 
     * @param file
     *            An <code>SmbFile</code> representing the file to write to

///

The only new thing is the `callbacks=invoices_callback_router.routes` as an argument to the *path operation decorator*. We'll see what that is next.

## Documenting the callback

The actual callback code will depend heavily on your own API app.

And it will probably vary a lot from one app to the next.

	// There are two possibilities:
	// - We use a KMS -> There must be non-empty key ID and a KMS data key.
	// - We use a K/V -> There must be no key ID and no KMS data key.
	// Otherwise, the caller has passed an invalid argument combination.
	if keyID == "" && len(kmsKey) != 0 {
		logger.CriticalIf(context.Background(), errors.New("The key ID must not be empty if a KMS data key is present"))
	}
	if keyID != "" && len(kmsKey) == 0 {

// [Writer.CreateHeader], [Writer.CreateRaw], or [Writer.Close].
//
// In contrast to [Writer.CreateHeader], the bytes passed to Writer are not compressed.
//
// CreateRaw's argument is stored in w. If the argument is a pointer to the embedded
// [FileHeader] in a [File] obtained from a [Reader] created from in-memory data,
// then w will refer to all of that memory.