## 🎧 🈸

 `Union` `Union[str, None]` 🚫 ⚙️ FastAPI, ✋️ 🔜 ✔ 👆 👨‍🎨 🤝 👆 👍 🐕‍🦺 & 🔍 ❌.

///

## 🍵 Pydantic

Check more details in the [Deployment](deployment/index.md){.internal-link target=_blank} section.

///

## Benchmarks and speed

///

## Unteranwendungen

        // this generates timestamped versions like maven-resolver-provider:
        // https://github.com/apache/maven/blob/03df5f7c639db744a3597c7175c92c8e2a27767b/maven-resolver-provider/src/main/java/org/apache/maven/repository/internal/RemoteSnapshotMetadata.java#L79
        String version = artifact.getVersion();
        String qualifier = formatDate(timestamp, true) + '-' + buildNumber;

Использование относительного URL важно для того, чтобы ваше приложение продолжало работать даже в таких сложных случаях, как оно находится [за прокси-сервером](../../advanced/behind-a-proxy.md){.internal-link target=_blank}.

///

Możesz również zdefiniować to jako normalną funkcję zamiast `async def`:

{* ../../docs_src/first_steps/tutorial003.py hl[7] *}

/// note

Jeśli nie znasz różnicy, sprawdź [Async: *"In a hurry?"*](../async.md#in-a-hurry){.internal-link target=_blank}.

///

### Krok 5: zwróć zawartość

{* ../../docs_src/first_steps/tutorial001.py hl[8] *}

Możesz zwrócić `dict`, `list`, pojedynczą wartość jako `str`, `int`, itp.

import java.util.concurrent.atomic.AtomicBoolean
import kotlin.test.assertFailsWith
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.ResponseBody.Companion.toResponseBody
import okhttp3.internal.and
import okio.Buffer
import okio.BufferedSource
import okio.ByteString
import okio.ByteString.Companion.decodeHex
import okio.ForwardingSource
import okio.buffer
import org.junit.jupiter.api.Test

     * as defined in plugin.xml since 4.0.0-alpha-3.
     *
     * @param requiredMavenVersion Maven version required by the plugin
     * @since 3.0.2
     */
    // used by maven-core's org.apache.maven.plugin.internal.DefaultMavenPluginManager#getPluginDescriptor(...)
    // and PluginDescriptorBuilder since 4.0.0-alpha-3
    public void setRequiredMavenVersion(String requiredMavenVersion) {

OpenAPI doesn't support a way to declare a *path parameter* to contain a *path* inside, as that could lead to scenarios that are difficult to test and define.

Nevertheless, you can still do it in **FastAPI**, using one of the internal tools from Starlette.

And the docs would still work, although not adding any documentation telling that the parameter should contain a path.

### Path convertor