So we are going to use that same knowledge to document how the *external API* should look like... by creating the *path operation(s)* that the external API should implement (the ones your API will call).

/// tip

When writing the code to document a callback, it might be useful to imagine that you are that *external developer*. And that you are currently implementing the *external API*, not *your API*.

     * <br/>
     * Supported filters:
     * <ul>
     *     <li>"h" or "h(num)" - highest version or top list of highest ones filter</li>
     *     <li>"l" or "l(num)" - lowest version or bottom list of lowest ones filter</li>
     *     <li>"s" - contextual snapshot filter</li>
     *     <li>"ns" - unconditional snapshot filter (no snapshots selected from ranges)</li>

            set(value) = Unit

        operator fun String.invoke(p: String, block: String.() -> Unit) = Unit

        ${""/* For Kotlin DSL, we generate sources with collection types mapped to the Kotlin ones. See `org.gradle.kotlin.dsl.internal.sharedruntime.codegen.ApiTypeProviderKt#mappedTypeStrings` */}

これらはすべて結合されて OpenAPI に含まれ、API ドキュメントに表示されます:

<img src="/img/tutorial/additional-responses/image01.png">

## 事前定義レスポンスとカスタムの組み合わせ { #combine-predefined-responses-and-custom-ones }

多くの *path operations* に適用できる事前定義のレスポンスを用意しつつ、各 *path operation* ごとに必要なカスタムレスポンスと組み合わせたい場合があります。

そのような場合、Python の `**dict_to_unpack` による `dict` の「アンパック」テクニックを使えます:

```Python
old_dict = {

    // have this Entry. The value in the map becomes false when this first entry has been copied, so
    // we know not to copy the remaining ones.
    IdentityHashMap<Entry<K, V>, Boolean> duplicates = null;
    int dupCount = 0;
    for (int entryIndex = n - 1; entryIndex >= 0; entryIndex--) {

        // spec says that we may repeat the request without modifications. Modern browsers also
        // repeat the request (even non-idempotent ones.)
        if (!chain.retryOnConnectionFailure) {
          // The application layer has directed us not to retry the request.
          return null
        }

        val requestBody = userResponse.request.body

Declara la variable, con la misma sintaxis de dos puntos (`:`).

Como tipo, pon `list`.

Como la lista es un tipo que contiene algunos tipos internos, los pones entre corchetes:

{* ../../docs_src/python_types/tutorial006_py310.py hl[1] *}

/// info | Información

Esos tipos internos en los corchetes se denominan "parámetros de tipo".

You can check the currently [existing pull requests](https://github.com/fastapi/fastapi/pulls) for your language. You can filter the pull requests by the ones with the label for your language. For example, for Spanish, the label is [`lang-es`](https://github.com/fastapi/fastapi/pulls?q=is%3Aopen+sort%3Aupdated-desc+label%3Alang-es+label%3Aawaiting-review).

Para ver la diferencia, imagina la siguiente historia sobre hamburguesas:

### Hamburguesas Concurrentes { #concurrent-burgers }

Vas con tu crush a conseguir comida rápida, te pones en fila mientras el cajero toma los pedidos de las personas frente a ti. 😍

<img src="/img/async/concurrent-burgers/concurrent-burgers-01.png" class="illustration">

        excludedPackages.add("org.gradle.plugins.binaries.model");

        // Exclude classes that were moved in a different package but the deprecated ones are not removed yet
        excludedPackages.add("org.gradle.platform.base.test");
        return excludedPackages;
    }