<span style="color: green;">INFO</span>:     Waiting for application startup.
<span style="color: green;">INFO</span>:     Application startup complete.
```

</div>

!!! note "Nota"
    El comando `uvicorn main:app` se refiere a:

    * `main`: el archivo `main.py` (el "módulo" de Python).
    * `app`: el objeto creado dentro de `main.py` con la línea `app = FastAPI()`.

    assertFailsWith<IllegalArgumentException> {
      builder.header("Name", s)
    }
    assertFailsWith<IllegalArgumentException> {
      builder.addHeader("Name", s)
    }
  }

  @Test
  fun noTag() {
    val request =
      Request.Builder()
        .url("https://square.com")
        .build()
    assertThat(request.tag<Any>()).isNull()
    assertThat(request.tag(Any::class)).isNull()

        def x = Attribute.of("x", String)
        def a = Attribute.of("a", Flavor)
        def c = Attribute.of("c", ConcreteNamed)

        schema.attributeDisambiguationPrecedence(Attribute.of("notA", Flavor), Attribute.of("notB", String), Attribute.of("notC", ConcreteNamed))

        def requested = AttributeTestUtil.attributesTyped(
                (x): "x",

    assertFailsWith<IllegalArgumentException> {
      builder.header("Name", s)
    }
    assertFailsWith<IllegalArgumentException> {
      builder.addHeader("Name", s)
    }
  }

  @Test
  fun noTag() {
    val request =
      Request.Builder()
        .url("https://square.com")
        .build()
    assertThat(request.tag()).isNull()
    assertThat(request.tag(Any::class.java)).isNull()

func TestFowler(t *testing.T) {
	files, err := filepath.Glob("testdata/*.dat")
	if err != nil {
		t.Fatal(err)
	}
	for _, file := range files {
		t.Log(file)
		testFowler(t, file)
	}
}

var notab = MustCompilePOSIX(`[^\t]+`)

func testFowler(t *testing.T, file string) {
	f, err := os.Open(file)
	if err != nil {
		t.Error(err)
		return
	}
	defer f.Close()
	b := bufio.NewReader(f)

        buildFile << """
            apply plugin: 'swift-application'
        """

        app.writeToProject(testDirectory)
        succeeds("xcode")
        settingsFile.text = "rootProject.name = 'NotApp'"

        when:
        def result = xcodebuild
            .withProject(rootXcodeProject)
            .withScheme('App')
            .fails()
        then:

```Python hl_lines="2"
@app.get('/')
async def read_results():
    results = await some_library()
    return results
```

!!! note "Nota"
    Solo puedes usar `await` dentro de funciones creadas con `async def`.

---

@app.get("/")
async def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
async def read_item(item_id: int, q: Optional[str] = None):
    return {"item_id": item_id, "q": q}
```

**Nota**:

e vuoi approfondire, consulta la sezione  _"In a hurry?"_ su <a href="https://fastapi.tiangolo.com/async/#in-a-hurry" target="_blank">`async` e `await` nella documentazione</a>.

</details>

### Esegui il server

@app.get("/")
async def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
async def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

**Nota**:

Se você não sabe, verifique a seção _"In a hurry?"_ sobre <a href="https://fastapi.tiangolo.com/async/#in-a-hurry" target="_blank">`async` e `await` nas docs</a>.

</details>

### Rode

@app.get("/")
async def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
async def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

**Nota**:

Si no lo sabes, revisa la sección _"¿Con prisa?"_ sobre <a href="https://fastapi.tiangolo.com/es/async/#con-prisa" target="_blank">`async` y `await` en la documentación</a>.

</details>

### Córrelo