// The InetSocketAddress was specified with a string (either a numeric IP or a host name). If
      // it is a name, all IPs for that name should be tried. If it is an IP address, only that IP
      // address should be tried.
      val address = address ?: return hostName

      // The InetSocketAddress has a specific address: we should only try that address. Therefore we

And there are several ways to get help too.

## Subscribe to the newsletter

You can subscribe to the (infrequent) [**FastAPI and friends** newsletter](newsletter.md){.internal-link target=_blank} to stay updated about:

* News about FastAPI and friends 🚀
* Guides 📝
* Features ✨
* Breaking changes 🚨
* Tips and tricks ✅

## Follow FastAPI on Twitter

    if (ktTypeAsText.contains(" -> ")) {
        // This is a function of some sort
        return name.startsWith("kotlin.jvm.functions.Function")
    }

    val ktTypeRawName = ktTypeAsText
        .trimEnd('?') // nullability is not part of JVM types
        .substringBefore('<') // generics are not part of parameter types in JVM method signatures

    val thisTypeAsKt = primitiveTypeStrings[name] ?: name

![editor support](https://fastapi.tiangolo.com/img/pycharm-completion.png)

Obtendrás completado para tu código que podrías haber considerado imposible antes. Por ejemplo, el key `price` dentro del JSON body (que podría haber estado anidado) que viene de un request.

Ya no pasará que escribas los nombres de key equivocados, o que tengas que revisar constantemente la documentación o desplazarte arriba y abajo para saber si usaste `username` o `user_name`.

### Corto

!!! check "Revisa"
    Observa que el valor que recibió (y devolvió) tu función es `3`, como un Python `int`, y no un string `"3"`.

    Entonces, con esa declaración de tipos **FastAPI** te da <abbr title="convertir el string que viene de un HTTP request a datos de Python">"parsing"</abbr> automático del request.

## Validación de datos

**FastAPI** wouldn't exist if not for the previous work of others.

There have been many tools created before that have helped inspire its creation.

I have been avoiding the creation of a new framework for several years. First I tried to solve all the features covered by **FastAPI** using many different frameworks, plug-ins, and tools.

And if you select the scope `me` but not the scope `items`, you will be able to access `/users/me/` but not `/users/me/items/`.

That's what would happen to a third party application that tried to access one of these *path operations* with a token provided by a user, depending on how many permissions the user gave the application.

## About third party integrations

- [`KT-57893`](https://youtrack.jetbrains.com/issue/KT-57893) K1/K2 inconsistency on smart casts of internally visible properties in friend modules
- [`KT-57876`](https://youtrack.jetbrains.com/issue/KT-57876) K2: stack overflow in compiler FIR deserialization on nested type-target annotation class used in enclosing class

        this.proxy = proxy
      }

    /**
     * Sets the proxy selection policy to be used if no [proxy][proxy] is specified explicitly. The
     * proxy selector may return multiple proxies; in that case they will be tried in sequence until
     * a successful connection is established.
     *
     * If unset, the [system-wide default][ProxySelector.getDefault] proxy selector will be used.
     */

Pour expliquer la différence, voici une histoire de burgers :

#### Burgers concurrents

Vous amenez votre crush 😍 dans votre fast food 🍔 favori, et faites la queue pendant que le serveur 💁 prend les commandes des personnes devant vous.

Puis vient votre tour, vous commandez alors 2 magnifiques burgers 🍔 pour votre crush 😍 et vous.

Vous payez 💸.