# CORS (オリジン間リソース共有)

<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS" class="external-link" target="_blank">CORSまたは「オリジン間リソース共有」</a> は、ブラウザで実行されているフロントエンドにバックエンドと通信するJavaScriptコードがあり、そのバックエンドがフロントエンドとは異なる「オリジン」にある状況を指します。

## オリジン

オリジンはプロトコル (`http`、`https`) とドメイン (`myapp.com`、`localhost`、`localhost.tiangolo.com`) とポート (`80`、`443`、`8080`) の組み合わせです。

したがって、以下はすべて異なるオリジンです:

* `http://localhost`
* `https://localhost`

到目前为止，通过文档中的所有教程，您可能已经在**单个进程**上运行了像 Uvicorn 这样的**服务器程序**。

部署应用程序时，您可能希望进行一些**进程复制**，以利用**多核**并能够处理更多请求。

正如您在上一章有关[部署概念](concepts.md){.internal-link target=_blank}中看到的，您可以使用多种策略。

在这里我将向您展示如何将 <a href="https://gunicorn.org/" class="external-link" target="_blank">**Gunicorn**</a> 与 **Uvicorn worker 进程** 一起使用。

/// info

如果您正在使用容器，例如 Docker 或 Kubernetes，我将在下一章中告诉您更多相关信息：[容器中的 FastAPI - Docker](docker.md){.internal-link target=_blank}。

 * http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/test/tck/AbstractExecutorServiceTest.java?revision=1.30
 * which contained the following notice:
 *
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

        // parameters but this is sufficient for now. Ultimately we want components like Builders to provide a way to
        // extend the command line to accept its own configuration parameters.
        //
        if (context.invokerRequest.options().threads().isPresent()) {
            int degreeOfConcurrency = calculateDegreeOfConcurrency(

benchmarks independientes de TechEmpower muestran aplicaciones de **FastAPI** que se ejecutan en Uvicorn como <a href="https://www.techempower.com/benchmarks/#section=test&runid=7464e520-0dc2-473d-bd34-dbdfd7e85911&hw=ph&test=query&l= zijzen-7" class="external-link" target="_blank">uno de los frameworks de Python más rápidos disponibles</a>, solo por debajo de Starlette y Uvicorn (utilizados internamente por FastAPI). (*)

Pero al comprobar benchmarks y comparaciones debes tener en cuenta lo siguiente....

tests de performance de TechEmpower montrent que les applications **FastAPI** tournant sous Uvicorn comme <a href="https://www.techempower.com/benchmarks/#section=test&runid=7464e520-0dc2-473d-bd34-dbdfd7e85911&hw=ph&test=query&l=zijzen-7" class="external-link" target="_blank">étant l'un des frameworks Python les plus rapides disponibles</a>, seulement inférieur à Starlette et Uvicorn (tous deux utilisés au cœur de FastAPI). (*)

Mais en prêtant attention aux tests de performance et aux comparaisons,...

  // Groups is the groups you're testing for.
  // +optional
  repeated string groups = 4;

  // Extra corresponds to the user.Info.GetExtra() method from the authenticator.  Since that is input to the authorizer
  // it needs a reflection here.
  // +optional
  map<string, ExtraValue> extra = 5;

  // UID information about the requesting user.
  // +optional
  optional string uid = 6;
}

Mas um arquivo dotenv não precisa ter esse nome exato.

///

Pydantic suporta a leitura desses tipos de arquivos utilizando uma biblioteca externa. Você pode ler mais em <a href="https://docs.pydantic.dev/latest/concepts/pydantic_settings/#dotenv-env-support" class="external-link" target="_blank">Pydantic Settings: Dotenv (.env) support</a>.

/// dica

Para que isso funcione você precisa executar `pip install python-dotenv`.

            options = {};

        //allow setting options with data attributes
        //data-api options will be overwritten with custom javascript options
        options = $.extend(this.element.data(), options);

        //html template for the picker UI
        if (typeof options.template !== 'string' && !(options.template instanceof $))
            options.template =

import org.slf4j.LoggerFactory;

/**
 * @since 3.0
 */
// TODO The configuration for the lifecycle needs to be externalized so that I can use the annotations properly for the
// wiring and reference and external source for the lifecycle configuration.
@Named
@Singleton
public class DefaultLifecycles {
    public static final String[] STANDARD_LIFECYCLES = {"clean", "default", "site"};