Приклади використання:

* Надсилання email-сповіщень після виконання певної дії:
    * Підключення до поштового сервера та надсилання листа може займати кілька секунд. Ви можете відразу повернути відповідь, а email відправити у фоні.
* Обробка даних:

Par exemple, il était clair que l'idéal était de se baser sur les annotations de type Python standard.

De plus, la meilleure approche était d'utiliser des normes déjà existantes.

            }
        }
    }
}

class NullawayCompatibilityRule : AttributeCompatibilityRule<NullawayState> {
    override fun execute(details: CompatibilityCheckDetails<NullawayState>) {
        with(details) {
            when {
                // Nullaway-enabled targets must not depend on nullaway-disabled ones.

app = FastAPI()


class UserIn(BaseModel):
    username: str
    password: str
    email: EmailStr
    full_name: Union[str, None] = None


class UserOut(BaseModel):
    username: str
    email: EmailStr
    full_name: Union[str, None] = None


class UserInDB(BaseModel):
    username: str
    hashed_password: str
    email: EmailStr
    full_name: Union[str, None] = None

That should make more sense now. ✨

All that is what powers FastAPI (through Starlette) and what makes it have such an impressive performance.

## Very Technical Details { #very-technical-details }

/// warning

You can probably skip this.

These are very technical details of how **FastAPI** works underneath.

package tests_test

import (
	"testing"
	"time"

	"gorm.io/gorm"
)

func TestDefaultValue(t *testing.T) {
	type Harumph struct {
		gorm.Model
		Email   string    `gorm:"not null;index:,unique"`
		Name    string    `gorm:"notNull;default:foo"`
		Name2   string    `gorm:"size:233;not null;default:'foo'"`
		Name3   string    `gorm:"size:233;notNull;default:''"`
		Age     int       `gorm:"default:18"`

```Python
contents = myfile.file.read()
```

/// note | `async` Technical Details

When you use the `async` methods, **FastAPI** runs the file methods in a threadpool and awaits for them.

///

/// note | Starlette Technical Details

* «/// check»: «/// check | Verifique»
* «/// danger»: «/// danger | Cuidado»
* «/// info»: «/// info | Informação»
* «/// note | Technical Details»: «/// note | Detalhes Técnicos»
* «/// info | Very Technical Details»: «/// note | Detalhes Técnicos Avançados»
* «/// note»: «/// note | Nota»
* «/// tip»: «/// tip | Dica»
* «/// warning»: «/// warning | Atenção»
* «(you should)»: «(você deveria)»

If you try interacting with any of the two user interfaces, they will work correctly, because the browser will be able to talk to each specific app or sub-app.

### Technical Details: `root_path` { #technical-details-root-path }

When you mount a sub-application as described above, FastAPI will take care of communicating the mount path for the sub-application using a mechanism from the ASGI specification called a `root_path`.

        message = f"found query: {q}\n"
        background_tasks.add_task(write_log, message)
    return q


@app.post("/send-notification/{email}")
async def send_notification(
    email: str, background_tasks: BackgroundTasks, q: Annotated[str, Depends(get_query)]
):
    message = f"message to {email}\n"
    background_tasks.add_task(write_log, message)