The process that happens when your API app calls the *external API* is named a "callback". Because the software that the external developer wrote sends a request to your API and then your API *calls back*, sending a request to an *external API* (that was probably created by the same developer).

```
KEY:
notify_amqp[:name]  publish bucket notifications to AMQP endpoints

ARGS:
url*           (url)       AMQP server endpoint e.g. `amqp://myuser:mypassword@localhost:5672`
exchange       (string)    name of the AMQP exchange
exchange_type  (string)    AMQP exchange type

```

</div>

Sehen wir uns an, was jede dieser Optionen bedeutet:

* `main:app`: Das ist die gleiche Syntax, die auch von Uvicorn verwendet wird. `main` bedeutet das Python-Modul mit dem Namen `main`, also eine Datei `main.py`. Und `app` ist der Name der Variable, welche die **FastAPI**-Anwendung ist.
    * Stellen Sie sich einfach vor, dass `main:app` einer Python-`import`-Anweisung wie der folgenden entspricht:

        ```Python

	As    string    `parser:"( \"AS\"? @Ident )?"`
}

// JSONPathElement represents a keypath component
type JSONPathElement struct {
	Key            *ObjectKey `parser:"  @@"`               // ['name'] and .name forms
	Index          *int       `parser:"| \"[\" @Int \"]\""` // [3] form
	ObjectWildcard bool       `parser:"| @\".*\""`          // .* form
	ArrayWildcard  bool       `parser:"| @\"[*]\""`         // [*] form
}

	default:
		defer updateOSMetrics(osMetricOpenFileRFd, name)(err)
	}
	var e error
	fd, e = syscall.Open(name, flag|syscall.O_CLOEXEC, uint32(perm))
	if e != nil {
		return -1, &os.PathError{Op: "open", Path: name, Err: e}
	}
	return fd, nil
}

// Forked from Golang but chooses to avoid performing lookup
//
// osMkdirAll creates a directory named path,

  @J2ktIncompatible
  @GwtIncompatible // suite
  public static Test suite() {
    TestSuite suite = new TestSuite();
    suite.addTest(
        BiMapTestSuiteBuilder.using(new EnumBiMapGenerator())
            .named("EnumBiMap")
            .withFeatures(
                CollectionSize.ANY,
                CollectionFeature.SERIALIZABLE,
                CollectionFeature.SUPPORTS_ITERATOR_REMOVE,

### Pydantic v1 `regex` statt `pattern`

Vor Pydantic Version 2 und vor FastAPI Version 0.100.0, war der Name des Parameters `regex` statt `pattern`, aber das ist jetzt <abbr title="deprecated – obsolet, veraltet: Es soll nicht mehr verwendet werden">deprecated</abbr>.

Sie könnten immer noch Code sehen, der den alten Namen verwendet:

//// tab | Python 3.10+ Pydantic v1

```Python hl_lines="11"

                throw new UnknownHostException( name.name );
            }

            if( response.received && response.resultCode == 0 ) {
                return response.addrEntry;
            }
        } while( --n > 0 && request.isBroadcast );

        throw new UnknownHostException( name.name );
    }
    NbtAddress getByName( Name name, InetAddress addr )

                  }
                })
            .withFeatures(
                MapFeature.GENERAL_PURPOSE,
                CollectionFeature.SUPPORTS_ITERATOR_REMOVE,
                CollectionSize.ANY)
            .named("RowMapTestSuite")
            .createTestSuite());
    return suite;
  }

  private TreeBasedTable<String, Integer, Character> sortedTable;

  protected TreeBasedTable<String, Integer, Character> create(

		}
		ref.ForeignKey = f
	}

	for name, rel := range relation.JoinTable.Relationships.Relations {
		if _, ok := joinSchema.Relationships.Relations[name]; !ok {
			rel.Schema = joinSchema
			joinSchema.Relationships.Relations[name] = rel
		}
	}
	relation.JoinTable = joinSchema

	return nil
}

// Use use plugin
func (db *DB) Use(plugin Plugin) error {
	name := plugin.Name()