*   <li>If a constructor or factory method takes a parameter whose type is interface, a dynamic
   *       proxy will be passed to the method. It's possible that the method body expects an
   *       instance method of the passed-in proxy to be of a certain value yet the proxy isn't aware
   *       of the assumption, in which case the equality check before and after serialization will
   *       fail.

![editor ondersteuning](https://fastapi.tiangolo.com/img/pycharm-completion.png)

Je krijgt autocomletion die je voorheen misschien zelfs voor onmogelijk had gehouden. Zoals bijvoorbeeld de `price` key in een JSON body (die genest had kunnen zijn) die afkomstig is van een request.

crawler.document.file.max.digest.length=200
# Whether to append meta content from files.
crawler.document.file.append.meta.content=true
# Whether to append body content from files.
crawler.document.file.append.body.content=true
# Default language for file documents.
crawler.document.file.default.lang=
# Patterns to include for file index processing.
crawler.document.file.default.include.index.patterns=

		return
	}

	var rulesMap event.RulesMap
	if r.ContentLength < 0 {
		s.writeErrorResponse(w, errInvalidArgument)
		return
	}

	err := gob.NewDecoder(r.Body).Decode(&rulesMap)
	if err != nil {
		s.writeErrorResponse(w, err)
		return
	}

	globalEventNotifier.AddRulesMap(bucketName, rulesMap)
}

// HealthHandler - returns true of health

<img src="/img/tutorial/generate-clients/image08.png">

## Vorteile

Wenn Sie die automatisch generierten Clients verwenden, erhalten Sie **automatische Codevervollständigung** für:

* Methoden.
* Request-Payloads im Body, Query-Parameter, usw.
* Response-Payloads.

Außerdem erhalten Sie für alles **Inline-Fehlerberichte**.

/// note

Notice that `response_model` is a parameter of the "decorator" method (`get`, `post`, etc). Not of your *path operation function*, like all the parameters and body.

///

`response_model` receives the same type you would declare for a Pydantic model field, so, it can be a Pydantic model, but it can also be, e.g. a `list` of Pydantic models, like `List[Item]`.

      val callReference = reference as CallReference
      val message =
        "A connection to ${connection.route().address.url} was leaked. " +
          "Did you forget to close a response body?"
      Platform.get().logCloseableLeak(message, callReference.callStackTrace)

      references.removeAt(i)

      // If this was the last allocation, the connection is eligible for immediate eviction.

* Automatyczna dokumentacja modelu danych za pomocą <a href="https://json-schema.org/" class="external-link" target="_blank"><strong>JSON Schema</strong></a> (ponieważ OpenAPI bazuje na JSON Schema)....

![editor support](https://fastapi.tiangolo.com/img/pycharm-completion.png)

You will get completion in code you might even consider impossible before. As for example, the `price` key inside a JSON body (that could have been nested) that comes from a request.

No more typing the wrong key names, coming back and forth between docs, or scrolling up and down to find if you finally used `username` or `user_name`.

{* ../../docs_src/custom_response/tutorial006c.py hl[2,7,9] *}

### `StreamingResponse` { #streamingresponse }

Takes an async generator or a normal generator/iterator and streams the response body.

{* ../../docs_src/custom_response/tutorial007.py hl[2,14] *}

#### Using `StreamingResponse` with file-like objects { #using-streamingresponse-with-file-like-objects }