### The config file { #the-config-file }

Coming from the previous example, your `config.py` file could look like:

{* ../../docs_src/settings/app02_an_py310/config.py hl[10] *}

Notice that now we don't create a default instance `settings = Settings()`.

### The main app file { #the-main-app-file }

Now we create a dependency that returns a new `config.Settings()`.

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *

 */

/*
 * Portions of this file are modified versions of
 * 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/

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *

And that's what **HTTPS** is, it's just plain **HTTP** inside a **secure TLS connection** instead of a pure (unencrypted) TCP connection.

/// tip

Notice that the encryption of the communication happens at the **TCP level**, not at the HTTP level.

///

### HTTPS Request { #https-request }

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *

- Встановити заголовок `Cache-Control: no-cache`, щоб **запобігти кешуванню** потоку.
- Встановити спеціальний заголовок `X-Accel-Buffering: no`, щоб **запобігти буферизації** у деяких проксі, наприклад Nginx.

fastapi[standard]>=0.112.0,<0.113.0
```

這表示會使用 `0.112.0`（含）以上但小於 `0.113.0` 的版本，例如 `0.112.2` 也會被接受。

如果你使用其他安裝管理工具，例如 `uv`、Poetry、Pipenv 等，它們也都有可用來指定套件特定版本的方法。

## 可用版本 { #available-versions }

你可以在 [發行說明](../release-notes.md) 查看可用版本（例如用來確認目前最新版本）。

## 關於版本 { #about-versions }

依照語意化版本的慣例，任何低於 `1.0.0` 的版本都可能加入破壞性變更。

FastAPI 也遵循慣例：任何「PATCH」版本變更僅用於修正錯誤與非破壞性變更。

/// tip

「PATCH」是最後一個數字，例如在 `0.2.3` 中，PATCH 版本是 `3`。

///

    return new StringBuilder((int) min(size * 8L, Ints.MAX_POWER_OF_TWO));
  }

  /**
   * Returns a {@link Collection} of all the permutations of the specified {@link Iterable}.
   *
   * <p><i>Notes:</i> This is an implementation of the algorithm for Lexicographical Permutations
   * Generation, described in Knuth's "The Art of Computer Programming", Volume 4, Chapter 7,