# Query Parametreleri ve String Doğrulamaları { #query-parameters-and-string-validations }

**FastAPI**, parametreleriniz için ek bilgi ve doğrulamalar (validation) tanımlamanıza izin verir.

Örnek olarak şu uygulamayı ele alalım:

{* ../../docs_src/query_params_str_validations/tutorial001_py310.py hl[7] *}

labels.facet_label_title=Etichetta
labels.facet_timestamp_title=Periodo
labels.facet_timestamp_1day=Ultime 24 ore
labels.facet_timestamp_1week=Ultima settimana
labels.facet_timestamp_1month=Ultimo mese
labels.facet_timestamp_1year=Ultimo anno
labels.facet_timestamp_3month=Ultimi 3 mesi
labels.facet_timestamp_6month=Ultimi 6 mesi
labels.facet_timestamp_2year=Ultimi 2 anni
labels.facet_timestamp_3year=Ultimi 3 anni

    contents = f.read()
    print(contents)
```

Por baixo dos panos, o código `open("./somefile.txt")` cria um objeto que é chamado de "Gerenciador de Contexto".

Quando o bloco `with` finaliza, ele se certifica de fechar o arquivo, mesmo que tenha ocorrido alguma exceção.

{* ../../docs_src/response_model/tutorial003_02_py310.py hl[8,10:11] *}

Bu basit durum FastAPI tarafından otomatik olarak ele alınır; çünkü dönüş tipi annotation’ı `Response` class’ıdır (veya onun bir subclass’ı).

Araçlar da memnun olur; çünkü hem `RedirectResponse` hem `JSONResponse`, `Response`’un subclass’ıdır. Yani type annotation doğrudur.

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