For example, Google login uses OpenID Connect (which underneath uses OAuth2).

But Facebook login doesn't support OpenID Connect. It has its own flavor of OAuth2.

### OpenID (not "OpenID Connect")

There was also an "OpenID" specification. That tried to solve the same thing as **OpenID Connect**, but was not based on OAuth2.

So, it was a complete additional system.

# OpenAPI

There are several utilities to handle OpenAPI.

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"_Honestly, what you've built looks super solid and polished. In many ways, it's what I wanted **Hug** to be - it's really inspiring to see someone build that._"

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"_Honestly, what you've built looks super solid and polished. In many ways, it's what I wanted **Hug** to be - it's really inspiring to see someone build that._"

* 대화형 API 문서가 새 본문과 함께 자동으로 업데이트 합니다:

![Swagger UI](https://fastapi.tiangolo.com/img/index/index-03-swagger-02.png)

* "Try it out" 버튼을 클릭하면, 매개변수를 채울 수 있게 해주고 직접 API와 상호작용 할 수 있습니다:

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-04-swagger-03.png)

- 互動式 API 文件會自動更新，並加入新的 body 請求：

![Swagger UI](https://fastapi.tiangolo.com/img/index/index-03-swagger-02.png)

- 點擊 "Try it out" 按鈕， 你可以填寫參數並直接與 API 互動：

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-04-swagger-03.png)

- 然後點擊 "Execute" 按鈕，使用者介面將會向 API 發送請求，並將結果顯示在螢幕上：

- ক্রিয়াশীল API নির্দেশিকা নথিটি স্বয়ংক্রিয়ভাবে উন্নীত হযে যাবে, নতুন বডি সহ:

![Swagger UI](https://fastapi.tiangolo.com/img/index/index-03-swagger-02.png)

- "Try it out" বাটনে চাপুন, এটি আপনাকে পেরামিটারগুলো পূরণ করতে এবং API এর সাথে সরাসরি ক্রিয়া-কলাপ করতে দিবে:

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-04-swagger-03.png)

Most of these ideas would be more or less **independent**, and in most cases you should only need to study them if they apply directly to **your project**.

If something seems interesting and useful to your project, go ahead and check it, but otherwise, you might probably just skip them.

!!! tip

!!! tip
    The next sections are **not necessarily "advanced"**.

    And it's possible that for your use case, the solution is in one of them.

## Read the Tutorial first

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"_Honestly, what you've built looks super solid and polished. In many ways, it's what I wanted **Hug** to be - it's really inspiring to see someone build that._"