* invalid or in error.
   *
   * @since 8.0
   */
  public static final byte SUB = 26;

  /**
   * Escape: A control character intended to provide code extension (supplementary characters) in
   * general information interchange. The Escape character itself is a prefix affecting the
   * interpretation of a limited number of contiguously following characters.
   *
   * @since 8.0

**FastAPI Extension** доступне для [VS Code](https://code.visualstudio.com/) і [Cursor](https://www.cursor.com/). Його можна встановити безпосередньо з панелі Extensions у кожному редакторі, знайшовши «FastAPI» і вибравши розширення від **FastAPI Labs**. Розширення також працює у браузерних редакторах, таких як [vscode.dev](https://vscode.dev) і [github.dev](https://github.dev).

### Виявлення застосунку { #application-discovery }

import mockwebserver3.junit5.StartStop
import okhttp3.internal.SuppressSignatureCheck
import org.junit.jupiter.api.extension.BeforeAllCallback
import org.junit.jupiter.api.extension.BeforeEachCallback
import org.junit.jupiter.api.extension.ExtensionContext
import org.junit.jupiter.api.extension.ExtensionContext.Namespace
import org.junit.platform.commons.support.AnnotationSupport.findAnnotatedFields

import assertk.assertThat
import assertk.assertions.hasMessage
import kotlin.test.assertFailsWith
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.BeforeEachCallback
import org.junit.jupiter.api.extension.ExtensionContext
import org.junit.jupiter.api.extension.RegisterExtension

class OkHttpClientTestRuleTest {
  lateinit var extensionContext: ExtensionContext

  @RegisterExtension @JvmField

import java.util.logging.Handler
import java.util.logging.Level
import java.util.logging.LogRecord
import java.util.logging.Logger
import org.junit.jupiter.api.extension.AfterEachCallback
import org.junit.jupiter.api.extension.BeforeEachCallback
import org.junit.jupiter.api.extension.ExtensionContext
import org.junit.rules.TestRule
import org.junit.runner.Description
import org.junit.runners.model.Statement

/**

Resmi [FastAPI Extension](https://marketplace.visualstudio.com/items?itemName=FastAPILabs.fastapi-vscode), FastAPI geliştirme akışınızı iyileştirir: *path operation* keşfi, gezinme, FastAPI Cloud’a deploy ve canlı log akışı.

Daha fazla ayrıntı için, GitHub deposundaki README’ye bakın: [GitHub repository](https://github.com/fastapi/fastapi-vscode).

## Kurulum ve Yükleme { #setup-and-installation }

The main feature I wanted from Django REST Framework was the automatic API documentation.

Then I found that there was a standard to document APIs, using JSON (or YAML, an extension of JSON) called Swagger.

And there was a web user interface for Swagger APIs already created. So, being able to generate Swagger documentation for an API would allow using this web user interface automatically.

/// tip | Consejo

Este es un punto de extensión de bajo nivel.

Si solo necesitas declarar responses adicionales, una forma más conveniente de hacerlo es con [Responses Adicionales en OpenAPI](additional-responses.md).

///

Puedes extender el esquema de OpenAPI para una *path operation* usando el parámetro `openapi_extra`.

### Extensiones de OpenAPI { #openapi-extensions }

import gradlebuild.basics.isPromotionBuild
import gradlebuild.basics.releasedVersionsFile
import gradlebuild.basics.repoRoot
import gradlebuild.identity.extension.GradleModuleExtension
import gradlebuild.identity.extension.ReleasedVersionsDetails
import gradlebuild.identity.provider.BuildTimestampFromBuildReceiptValueSource
import gradlebuild.identity.provider.BuildTimestampValueSource

from fastapi import FastAPI
from fastapi.testclient import TestClient
from inline_snapshot import snapshot

app = FastAPI()


@app.get("/", openapi_extra={"x-custom-extension": "value"})
def route_with_extras():
    return {}


client = TestClient(app)


def test_get_route():
    response = client.get("/")
    assert response.status_code == 200, response.text
    assert response.json() == {}