* Validar que existe un `item_id` en el path para requests usando `GET` y `PUT`.
* Validar que el `item_id` es del tipo `int` para requests de tipo `GET` y `PUT`.
    * Si no lo es, el cliente verá un mensaje de error útil y claro.
* Revisar si existe un query parameter opcional llamado `q` (cómo en `http://127.0.0.1:8000/items/foo?q=somequery`) para requests de tipo `GET`.

* <a href="https://github.com/Kludex/python-multipart" target="_blank"><code>python-multipart</code></a> - Követelmény ha <abbr title="converting the string that comes from an HTTP request into Python data">"parsing"</abbr>-ot akarsz támogatni, `request.form()`-al.
* <a href="https://pythonhosted.org/itsdangerous/" target="_blank"><code>itsdangerous</code></a> - Követelmény `SessionMiddleware` támogatáshoz.

- <a href="https://github.com/Kludex/python-multipart" target="_blank"><code>python-multipart</code></a> - আপনি যদি ফর্ম সহায়তা করতে চান তাহলে প্রয়োজন <abbr title="converting the string that comes from an HTTP request into Python data">"parsing"</abbr>, `request.form()` সহ।
- <a href="https://pythonhosted.org/itsdangerous/" target="_blank"><code>itsdangerous</code></a> - `SessionMiddleware` সহায়তার জন্য প্রয়োজন।

!!! tip "Tipp"
    Im nächsten Kapitel erfahren Sie, welche anderen „Dinge“, außer Funktionen, Sie als Abhängigkeiten verwenden können.

Immer wenn ein neuer Request eintrifft, kümmert sich **FastAPI** darum:

* Ihre Abhängigkeitsfunktion („Dependable“) mit den richtigen Parametern aufzurufen.
* Sich das Ergebnis von dieser Funktion zu holen.

* <a href="https://github.com/Kludex/python-multipart" target="_blank"><code>python-multipart</code></a> - ✔ 🚥 👆 💚 🐕‍🦺 📨 <abbr title="converting the string that comes from an HTTP request into Python data">"✍"</abbr>, ⏮️ `request.form()`.
* <a href="https://pythonhosted.org/itsdangerous/" target="_blank"><code>itsdangerous</code></a> - ✔ `SessionMiddleware` 🐕‍🦺.

* Validate that there is an `item_id` in the path for `GET` and `PUT` requests.
* Validate that the `item_id` is of type `int` for `GET` and `PUT` requests.
    * If it is not, the client will see a useful, clear error.
* Check if there is an optional query parameter named `q` (as in `http://127.0.0.1:8000/items/foo?q=somequery`) for `GET` requests.
    * As the `q` parameter is declared with `= None`, it is optional.

* <a href="https://github.com/JoshData/python-email-validator" target="_blank"><code>email_validator</code></a> - pour la validation des adresses email.

Utilisées par Starlette :

* <a href="https://requests.readthedocs.io" target="_blank"><code>requests</code></a> - Obligatoire si vous souhaitez utiliser `TestClient`.

* <a href="https://pythonhosted.org/itsdangerous/" target="_blank"><code>itsdangerous</code></a> - Необхідно для підтримки `SessionMiddleware`.

* <a href="https://github.com/Kludex/python-multipart" target="_blank"><code>python-multipart</code></a> - Eğer `request.form()` ile form <abbr title="HTTP isteği ile gelen string veriyi Python nesnesine çevirme.">dönüşümü</abbr> desteğini kullanacaksanız gereklidir.

-   <a href="https://github.com/Kludex/python-multipart" target="_blank"><code>python-multipart</code></a> - דרוש אם ברצונכם לתמוך ב <abbr title="המרת המחרוזת שמגיעה מבקשת HTTP למידע פייתון">"פרסור"</abbr> טפסים, באצמעות <code dir="ltr">request.form()</code>.
-   <a href="https://pythonhosted.org/itsdangerous/" target="_blank"><code>itsdangerous</code></a> - דרוש אם ברצונכם להשתמש ב - `SessionMiddleware`.