# Paramètres de requête et validations de chaînes de caractères

**FastAPI** vous permet de déclarer des informations et des validateurs additionnels pour vos paramètres de requêtes.

Commençons avec cette application pour exemple :

{* ../../docs_src/query_params_str_validations/tutorial001.py hl[9] *}

        // logger.debug(response.asString());
        return response;
    }

    protected Response checkDeleteMethod(final String path) {
        return given().contentType("application/json").header("Authorization", getTestToken()).delete(getApiPath() + "/" + path);
    }

    protected List<Map<String, Object>> getItemList(final Map<String, Object> body) {

/**
 * Access to platform-specific features.
 *
 * ### Session Tickets
 *
 * Supported on Android 2.3+.
 * Supported on JDK 8+ via Conscrypt.
 *
 * ### ALPN (Application Layer Protocol Negotiation)
 *
 * Supported on Android 5.0+.
 *
 * Supported on OpenJDK 8 via the JettyALPN-boot library or Conscrypt.
 *
 * Supported on OpenJDK 9+ via SSLParameters and SSLSocket features.
 *

    assertThat(body.value(0)).isEqualTo("c+=& d")
    assertThat(body.value(1)).isEqualTo("final frontier")
    assertThat(body.value(2)).isEqualTo("%25")
    assertThat(body.contentType().toString()).isEqualTo(
      "application/x-www-form-urlencoded",
    )
    val expected = "a%2B%3D%26+b=c%2B%3D%26+d&space%2C+the=final+frontier&%2525=%2525"
    assertThat(body.contentLength()).isEqualTo(expected.length.toLong())
    val out = Buffer()

INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [28720]
INFO:     Started server process [28722]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
```

</div>

<details markdown="1">
<summary><code>uvicorn main:app --reload</code> 명령에 관하여...</summary>

명령 `uvicorn main:app`은 다음을 나타냅니다:

INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [28720]
INFO:     Started server process [28722]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
```

</div>

<details markdown="1">
<summary>🔃 📋 <code>uvicorn main:app --reload</code>...</summary>

📋 `uvicorn main:app` 🔗:

INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [28720]
INFO:     Started server process [28722]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
```

</div>

<details markdown="1">
<summary>על הפקודה <code>uvicorn main:app --reload</code>...</summary>

הפקודה `uvicorn main:app` מתייחסת ל:

	// Assume roles with no JWT, handles AssumeRole.
	stsRouter.Methods(http.MethodPost).MatcherFunc(func(r *http.Request, rm *mux.RouteMatch) bool {
		ctypeOk := wildcard.MatchSimple("application/x-www-form-urlencoded*", r.Header.Get(xhttp.ContentType))
		authOk := wildcard.MatchSimple(signV4Algorithm+"*", r.Header.Get(xhttp.Authorization))
		noQueries := len(r.URL.RawQuery) == 0
		return ctypeOk && authOk && noQueries

constraints.UriType.message = {item} tiene una URI no reconocida.
constraints.CronExpression.message = {item} no es una expresión CRON válida.

# ----------------------------------------------------------
# Application Exception
# ---------------------
# /- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# five framework-embedded messages (don't change key names)
# - - - - - - - - - -/

# Eventos de Lifespan

Puedes definir lógica (código) que debería ser ejecutada antes de que la aplicación **inicie**. Esto significa que este código será ejecutado **una vez**, **antes** de que la aplicación **comience a recibir requests**.

De la misma manera, puedes definir lógica (código) que debería ser ejecutada cuando la aplicación esté **cerrándose**. En este caso, este código será ejecutado **una vez**, **después** de haber manejado posiblemente **muchos requests**.