$ python main.py

Hello World from Python
```

</div>

/// tip

Bạn có thể đọc thêm về điều này tại <a href="https://12factor.net/config" class="external-link" target="_blank">The Twelve-Factor App: Config</a>.

///

## Các Kiểu (Types) và Kiểm tra (Validation)

// The env var no longer exists afterwards
$ python main.py

Hello World from Python
```

</div>

/// tip

詳しくは <a href="https://12factor.net/config" class="external-link" target="_blank">The Twelve-Factor App: Config</a> を参照してください。

///

## 型とバリデーション

環境変数は**テキスト文字列**のみを扱うことができます。これは、環境変数がPython外部に存在し、他のプログラムやシステム全体（Linux、Windows、macOS間の互換性を含む）と連携する必要があるためです。

$ python main.py

Hello World from Python
```

</div>

/// tip | Dica

Você pode ler mais sobre isso em: <a href="https://12factor.net/pt_br/config" class="external-link" target="_blank">The Twelve-Factor App: Configurações</a>.

///

### Tipagem e Validação

oh! she knows such a very little!  Besides, SHE'S she, and I'm I,
and--oh dear, how puzzling it all is!  I'll try if I know all the
things I used to know.  Let me see:  four times five is twelve,
and four times six is thirteen, and four times seven is--oh dear!
I shall never get to twenty at that rate!  However, the
Multiplication Table doesn't signify:  let's try Geography.

2169          ; mapped                 ; 0078          # 1.1  ROMAN NUMERAL TEN
216A          ; mapped                 ; 0078 0069     # 1.1  ROMAN NUMERAL ELEVEN
216B          ; mapped                 ; 0078 0069 0069 #1.1  ROMAN NUMERAL TWELVE
216C          ; mapped                 ; 006C          # 1.1  ROMAN NUMERAL FIFTY
216D          ; mapped                 ; 0063          # 1.1  ROMAN NUMERAL ONE HUNDRED

  /**
   * Returns the next header to process unless this scope is exhausted.
   *
   * This returns null if:
   *
   *  * The stream is exhausted.
   *  * We've read all of the bytes of an object whose length is known.
   *  * We've reached the [DerHeader.TAG_END_OF_CONTENTS] of an object whose length is unknown.
   */
  fun peekHeader(): DerHeader? {
    var result = peekedHeader

    if (result == null) {

 * **TlsVersion**: javaName

#### Renamed Functions

* **Headers.of()**: for symmetry with `listOf()`, `setOf()`, etc., we’ve replaced
  `Headers.of(String...)` with `headersOf(vararg String)`.

#### Extension Functions

We’ve migrated from static functions to extension functions where we think they fit.

| Java                                | Kotlin                          |

    * Ficar por dentro de novas ideias, artigos, e ferramentas criadas por mim.
    * Me siga para saber quando eu publicar algo novo.

## Tweete sobre **FastAPI**

<a href="https://x.com/compose/tweet?text=I'm loving @fastapi because... https://github.com/fastapi/fastapi" class="external-link" target="_blank">Tweete sobre o **FastAPI**</a> e compartilhe comigo e com os outros o porque de gostar do FastAPI. 🎉

 * and the implementation should respond with a new request that sets the "Authorization" header.
 *
 * ```java
 * if (response.request().header("Authorization") != null) {
 *   return null; // Give up, we've already failed to authenticate.
 * }
 *
 * String credential = Credentials.basic(...)
 * return response.request().newBuilder()
 *     .header("Authorization", credential)
 *     .build();
 * ```
 *

  private val messageAndCloseQueue = ArrayDeque<Any>()

  /** The total size in bytes of enqueued but not yet transmitted messages. */
  private var queueSize = 0L

  /** True if we've enqueued a close frame. No further message frames will be enqueued. */
  private var enqueuedClose = false

  /** The close code from the peer, or -1 if this web socket has not yet read a close frame. */