And the rest will be handled by **FastAPI**.

If you run it and go to <a href="http://localhost:8000/v1/" class="external-link" target="_blank">http://localhost:8000/v1/</a> you will see the response from Flask:

```txt
Hello, World from Flask!
```

And if you go to <a href="http://localhost:8000/v2" class="external-link" target="_blank">http://localhost:8000/v2</a> you will see the response from FastAPI:

```JSON
{
    "message": "Hello World"

```

</div>

then the internal variable `__name__` in your file, created automatically by Python, will have as value the string `"__main__"`.

So, the section:

```Python
    uvicorn.run(app, host="0.0.0.0", port=8000)
```

will run.

---

This won't happen if you import that module (file).

So, if you have another file `importer.py` with:

```Python
from myapp import app

# Some more code
```

{* ../../docs_src/query_params_str_validations/tutorial011_an_py310.py hl[9] *}

Then, with a URL like:

```
http://localhost:8000/items/?q=foo&q=bar
```

you would receive the multiple `q` *query parameters'* values (`foo` and `bar`) in a Python `list` inside your *path operation function*, in the *function parameter* `q`.

maintainers:
- login: tiangolo
  answers: 1900
  avatarUrl: https://avatars.githubusercontent.com/u/1326112?u=cb5d06e73a9e1998141b1641aa88e443c6717651&v=4
  url: https://github.com/tiangolo
experts:
- login: tiangolo
  count: 1900
  avatarUrl: https://avatars.githubusercontent.com/u/1326112?u=cb5d06e73a9e1998141b1641aa88e443c6717651&v=4
  url: https://github.com/tiangolo
- login: YuriiMotov
  count: 971

### Hey API { #hey-api }

Once we have a FastAPI app with the models, we can use Hey API to generate a TypeScript client. The fastest way to do that is via npx.

```sh
npx @hey-api/openapi-ts -i http://localhost:8000/openapi.json -o src/client
```

This will generate a TypeScript SDK in `./src/client`.

  stars: 892
  owner_login: dunossauro
  owner_html_url: https://github.com/dunossauro
- name: marker-api
  html_url: https://github.com/adithya-s-k/marker-api
  stars: 890
  owner_login: adithya-s-k
  owner_html_url: https://github.com/adithya-s-k
- name: RuoYi-Vue3-FastAPI
  html_url: https://github.com/insistence/RuoYi-Vue3-FastAPI
  stars: 884
  owner_login: insistence

If the client tries to go to `/items`, by default, it would be redirected to `/items/`.

But before setting the *CLI Option* `--forwarded-allow-ips` it could redirect to `http://localhost:8000/items/`.

But maybe your application is hosted at `https://mysuperapp.com`, and the redirection should be to `https://mysuperapp.com/items/`.

* Add note about using Body parameters without Pydantic. PR [#900](https://github.com/tiangolo/fastapi/pull/900) by [@pawamoy](https://github.com/pawamoy).
* Fix Pydantic field clone logic. PR [#899](https://github.com/tiangolo/fastapi/pull/899) by [@deuce2367](https://github.com/deuce2367).