</div>
    <div class="item">
      <a title="Scalar: Beautiful Open-Source API References from Swagger/OpenAPI files" style="display: block; position: relative;" href="https://github.com/scalar/scalar/?utm_source=fastapi&utm_medium=website&utm_campaign=top-banner" target="_blank">
        <span class="sponsor-badge">sponsor</span>
        <img class="sponsor-image" src="/img/sponsors/scalar-banner.svg" />
      </a>
    </div>

    img: https://fastapi.tiangolo.com/img/sponsors/blockbee.png
  - url: https://github.com/scalar/scalar/?utm_source=fastapi&utm_medium=website&utm_campaign=main-badge
    title: "Scalar: Beautiful Open-Source API References from Swagger/OpenAPI files"
    img: https://fastapi.tiangolo.com/img/sponsors/scalar.svg
  - url: https://www.propelauth.com/?utm_source=fastapi&utm_campaign=1223&utm_medium=mainbadge

# FastAPI doesn't currently support non-scalar Path parameters...

  - nihpo
  - armand-sauzay
  - databento-bot
  - databento
  - nanram22
  - Flint-company
  - porter-dev
  - fern-api
  - ndimares
  - svixhq
  - Alek99
  - codacy
  - zanfaruqui
  - scalar
  - bump-sh
  - andrew-propelauth
  - svix
  - zuplo-oss
  - zuplo
  - Kong
  - speakeasy-api
  - jess-render
  - blockbee-io
  - liblaber
  - render-sponsorships
  - renderinc

    response = client.get("/items?id=isbn-9781529046137")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "id": "isbn-9781529046137",
        "name": "The Hitchhiker's Guide to the Galaxy",
    }


def test_get_item_does_not_exist(client: TestClient):
    response = client.get("/items?id=isbn-nope")
    assert response.status_code == 200, response.text

  avatarUrl: https://avatars.githubusercontent.com/u/53824764?u=db3d0cea2f5fab64d810113c5039a369699a2774&v=4
  url: https://github.com/timothy-jeong
gerry-sabar:
  login: gerry-sabar
  count: 3
  avatarUrl: https://avatars.githubusercontent.com/u/1120123?v=4
  url: https://github.com/gerry-sabar
Rishat-F:
  login: Rishat-F
  count: 3
  avatarUrl: https://avatars.githubusercontent.com/u/66554797?v=4
  url: https://github.com/Rishat-F

Por ejemplo, si quieres leer o manipular el request body antes de que sea procesado por tu aplicación.

/// danger | Advertencia

Esta es una funcionalidad "avanzada".

Si apenas estás comenzando con **FastAPI**, quizás quieras saltar esta sección.

///

## Casos de uso { #use-cases }

Algunos casos de uso incluyen:

    url: https://github.com/requestly
  - login: acsone
    avatarUrl: https://avatars.githubusercontent.com/u/7601056?v=4
    url: https://github.com/acsone
- - login: scalar
    avatarUrl: https://avatars.githubusercontent.com/u/301879?v=4
    url: https://github.com/scalar
  - login: Trivie
    avatarUrl: https://avatars.githubusercontent.com/u/8161763?v=4
    url: https://github.com/Trivie
- - login: takashi-yoneya

<a href="https://github.com/scalar/scalar/?utm_source=fastapi&utm_medium=website&utm_campaign=main-badge" target="_blank" title="Scalar: Beautiful Open-Source API References from Swagger/OpenAPI files"><img src="https://fastapi.tiangolo.com/img/sponsors/scalar.svg"></a>

- name: langserve
  html_url: https://github.com/langchain-ai/langserve
  stars: 2215
  owner_login: langchain-ai
  owner_html_url: https://github.com/langchain-ai
- name: solara
  html_url: https://github.com/widgetti/solara
  stars: 2122
  owner_login: widgetti
  owner_html_url: https://github.com/widgetti
- name: mangum
  html_url: https://github.com/Kludex/mangum
  stars: 2029
  owner_login: Kludex