When deploying applications you will probably want to have some **replication of processes** to take advantage of **multiple cores** and to be able to handle more requests.

As you saw in the previous chapter about [Deployment Concepts](concepts.md), there are multiple strategies you can use.

### Multiple Processes - Workers { #multiple-processes-workers }

If you have more clients than what a single process can handle (for example if the virtual machine is not too big) and you have **multiple cores** in the server's CPU, then you could have **multiple processes** running with the same application at the same time, and distribute all the requests among them.

process** (e.g. a Uvicorn process running your FastAPI application). They would all be **identical containers**, running the same thing, but each with its own process, memory, etc. That way you would take advantage of **parallelization** in **different cores** of the CPU, or even in **different machines**.

And the distributed container system with the **load balancer** would **distribute the requests** to each one of the containers with your app **in turns**. So, each request could be handled...

{* ../../docs_src/configure_swagger_ui/tutorial002_py310.py hl[3] *}

Essa configuração alteraria o tema de cores de destaque de sintaxe:

<img src="/img/tutorial/extending-openapi/image04.png">

## Alterar parâmetros de UI padrão do Swagger { #change-default-swagger-ui-parameters }

Uygulamaları deploy ederken, çok çekirdekten (multiple cores) faydalanmak ve daha fazla request'i karşılayabilmek için büyük olasılıkla process replikasyonu (birden fazla process) isteyeceksiniz.

- github.com/coredns/corefile-migration: [v1.0.24 → v1.0.25](https://github.com/coredns/corefile-migration/compare/v1.0.24...v1.0.25)
- github.com/coreos/go-oidc: [v2.2.1+incompatible → v2.3.0+incompatible](https://github.com/coreos/go-oidc/compare/v2.2.1...v2.3.0)
- github.com/cyphar/filepath-securejoin: [v0.3.4 → v0.4.1](https://github.com/cyphar/filepath-securejoin/compare/v0.3.4...v0.4.1)

## Mais informações { #more-info }

Para mais informações sobre <abbr title="Cross-Origin Resource Sharing">CORS</abbr>, consulte a [documentação do CORS da Mozilla](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS).

/// note | Detalhes Técnicos

Você também pode usar `from starlette.middleware.cors import CORSMiddleware`.

# Additional Status Codes { #additional-status-codes }

By default, **FastAPI** will return the responses using a `JSONResponse`, putting the content you return from your *path operation* inside of that `JSONResponse`.

It will use the default status code or the one you set in your *path operation*.

## Additional status codes { #additional-status-codes_1 }

* `max_age` - 設定瀏覽器快取 CORS 回應的最長秒數。預設為 `600`。

此中介軟體會回應兩種特定的 HTTP 請求類型...

### CORS 預檢請求 { #cors-preflight-requests }

任何帶有 `Origin` 與 `Access-Control-Request-Method` 標頭的 `OPTIONS` 請求。

在這種情況下，中介軟體會攔截傳入的請求並回應適當的 CORS 標頭，並回傳 `200` 或 `400`（僅供資訊參考）。

### 簡單請求 { #simple-requests }

任何帶有 `Origin` 標頭的請求。在這種情況下，中介軟體會如常將請求往下傳遞，但會在回應上加入適當的 CORS 標頭。

## 更多資訊 { #more-info }

# CORS (Cross-Origin Resource Sharing) { #cors-cross-origin-resource-sharing }

[CORS or "Cross-Origin Resource Sharing"](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS) refers to the situations when a frontend running in a browser has JavaScript code that communicates with a backend, and the backend is in a different "origin" than the frontend.

## Origin { #origin }