```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()


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


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

<details markdown="1">

    @Test
    public void testEncodingSpecialCharacters() {
        CurlRequest request = new CurlRequest(Method.GET, "https://example.com");

        // Test encoding of special characters
        request.param("query", "hello world & more");
        request.param("special", "ñ€±");

        // Should not throw exception
        assertNotNull(request);
    }

    @Test
    public void testUnsupportedEncodingThrowsException() {

		t.Fatalf("Failed to create 'uuid-ossp' extension, but got error %v", err)
	}

	DB.Migrator().DropTable(&Post{}, &Category{}, "post_categories")
	DB.AutoMigrate(&Post{}, &Category{})

	post := Post{
		Title: "Hello World",
		Categories: []*Category{
			{Title: "Coding"},
			{Title: "Golang"},
		},
	}

	if err := DB.Create(&post).Error; err != nil {
		t.Errorf("Failed, got error: %v", err)
	}
}

Create a file `main.py` with:

```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()


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


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

<details markdown="1">

		t.Fatalf("Failed to create 'uuid-ossp' extension, but got error %v", err)
	}

	DB.Migrator().DropTable(&Post{}, &Category{}, "post_categories")
	DB.AutoMigrate(&Post{}, &Category{})

	post := Post{
		Title: "Hello World",
		Categories: []*Category{
			{Title: "Coding"},
			{Title: "Golang"},
		},
	}

	if err := DB.Create(&post).Error; err != nil {
		t.Errorf("Failed, got error: %v", err)
	}
}

	if err != nil {
		// Failed to create newbucket, abort.
		t.Fatalf("%s : %s", instanceType, err.Error())
	}

	var (
		nilBytes    []byte
		data        = []byte("hello")
		fiveMBBytes = bytes.Repeat([]byte("a"), 5*humanize.MiByte)
	)
	invalidMD5 := getMD5Hash([]byte("meh"))
	invalidMD5Header := md5Header([]byte("meh"))

	testCases := []struct {
		bucketName    string

{* ../../docs_src/custom_response/tutorial009c.py hl[9:14,17] *}

Agora em vez de retornar:

```json
{"message": "Hello World"}
```

...essa resposta retornará:

```json
{
  "message": "Hello World"
}
```

Obviamente, você provavelmente vai encontrar maneiras muito melhores de se aproveitar disso do que a formatação de JSON. 😉

///

### Fonctions de chemin

Quand vous déclarez une *fonction de chemin* avec un `def` normal et non `async def`, elle est exécutée dans un groupe de threads (threadpool) externe qui est ensuite attendu, plutôt que d'être appelée directement (car cela bloquerait le serveur).

errors.failed_to_upload_synonym_file = Impossibile caricare il file dei sinonimi.
errors.failed_to_download_stemmeroverride_file = Impossibile scaricare il file di override dello stemmer.
errors.failed_to_upload_stemmeroverride_file = Impossibile caricare il file di override dello stemmer.
errors.failed_to_download_kuromoji_file = Impossibile scaricare il file Kuromoji.
errors.failed_to_upload_kuromoji_file = Impossibile caricare il file Kuromoji.

{* ../../docs_src/custom_response/tutorial009c.py hl[9:14,17] *}

🔜 ↩️ 🛬:

```json
{"message": "Hello World"}
```

...👉 📨 🔜 📨:

```json
{
  "message": "Hello World"
}
```

↗️, 👆 🔜 🎲 🔎 🌅 👍 🌌 ✊ 📈 👉 🌘 ❕ 🎻. 👶

## 🔢 📨 🎓

🕐❔ 🏗 **FastAPI** 🎓 👐 ⚖️ `APIRouter` 👆 💪 ✔ ❔ 📨 🎓 ⚙️ 🔢.