## 🗜 **FastAPI** 🈸

"🗜" ⛓ ❎ 🍕 "🔬" 🈸 🎯 ➡, 👈 ⤴️ ✊ 💅 🚚 🌐 🔽 👈 ➡, ⏮️ _➡ 🛠️_ 📣 👈 🎧-🈸.

### 🔝-🎚 🈸

🥇, ✍ 👑, 🔝-🎚, **FastAPI** 🈸, & 🚮 *➡ 🛠️*:

```Python hl_lines="3  6-8"
{!../../../docs_src/sub_applications/tutorial001.py!}
```

### 🎧-🈸

⤴️, ✍ 👆 🎧-🈸, & 🚮 *➡ 🛠️*.

👉 🎧-🈸 ➕1️⃣ 🐩 FastAPI 🈸, ✋️ 👉 1️⃣ 👈 🔜 "🗻":

```Python hl_lines="11  14-16"

如果需要两个独立的 FastAPI 应用，拥有各自独立的 OpenAPI 与文档，则需设置一个主应用，并**挂载**一个（或多个）子应用。

## 挂载 **FastAPI** 应用

**挂载**是指在特定路径中添加完全**独立**的应用，然后在该路径下使用*路径操作*声明的子应用处理所有事务。

### 顶层应用

首先，创建主（顶层）**FastAPI** 应用及其*路径操作*：

```Python hl_lines="3  6-8"
{!../../../docs_src/sub_applications/tutorial001.py!}
```

### 子应用

接下来，创建子应用及其*路径操作*。

子应用只是另一个标准 FastAPI 应用，但这个应用是被**挂载**的应用：

```Python hl_lines="11  14-16"

### برنامه سطح بالا

ابتدا برنامه اصلی سطح بالا، **FastAPI** و path operations آن را ایجاد کنید:


```Python hl_lines="3  6-8"
{!../../../docs_src/sub_applications/tutorial001.py!}
```

### زیر برنامه

سپس، زیر برنامه خود و path operations آن را ایجاد کنید.

### Top-level application

First, create the main, top-level, **FastAPI** application, and its *path operations*:

```Python hl_lines="3  6-8"
{!../../../docs_src/sub_applications/tutorial001.py!}
```

### Sub-application

Then, create your sub-application, and its *path operations*.

	SYS_LISTEN                  = 363
	SYS_ACCEPT4                 = 364
	SYS_GETSOCKOPT              = 365
	SYS_SETSOCKOPT              = 366
	SYS_GETSOCKNAME             = 367
	SYS_GETPEERNAME             = 368
	SYS_SENDTO                  = 369
	SYS_SENDMSG                 = 370
	SYS_RECVFROM                = 371
	SYS_RECVMSG                 = 372
	SYS_SHUTDOWN                = 373
	SYS_MLOCK2                  = 374

	SYS_PERF_EVENT_OPEN              = 364
	SYS_RECVMMSG                     = 365
	SYS_ACCEPT4                      = 366
	SYS_FANOTIFY_INIT                = 367
	SYS_FANOTIFY_MARK                = 368
	SYS_PRLIMIT64                    = 369
	SYS_NAME_TO_HANDLE_AT            = 370
	SYS_OPEN_BY_HANDLE_AT            = 371
	SYS_CLOCK_ADJTIME                = 372
	SYS_SYNCFS                       = 373

  } ]
}, {
  "scenario" : "org.gradle.performance.regression.android.RealLifeAndroidBuildPerformanceTest.run clean phthalic:assembleDebug",
  "durations" : [ {
    "testProject" : "largeAndroidBuild",
    "linux" : 368
  } ]
}, {
  "scenario" : "org.gradle.performance.regression.android.RealLifeAndroidBuildPerformanceTest.run help",
  "durations" : [ {
    "testProject" : "largeAndroidBuild",
    "linux" : 328
  } ]
}, {

	SYS_ACCEPT4                      = 364
	SYS_GETSOCKOPT                   = 365
	SYS_SETSOCKOPT                   = 366
	SYS_GETSOCKNAME                  = 367
	SYS_GETPEERNAME                  = 368
	SYS_SENDTO                       = 369
	SYS_SENDMSG                      = 370
	SYS_RECVFROM                     = 371
	SYS_RECVMSG                      = 372
	SYS_SHUTDOWN                     = 373

	} else if x == 363 {
		x += 363
	} else if x == 364 {
		x += 364
	} else if x == 365 {
		x += 365
	} else if x == 366 {
		x += 366
	} else if x == 367 {
		x += 367
	} else if x == 368 {
		x += 368
	} else if x == 369 {
		x += 369
	} else if x == 370 {
		x += 370
	} else if x == 371 {
		x += 371
	} else if x == 372 {
		x += 372
	} else if x == 373 {
		x += 373

So we put them in their own `dependencies` module (`app/dependencies.py`).

We will now use a simple dependency to read a custom `X-Token` header:

=== "Python 3.9+"

    ```Python hl_lines="3  6-8" title="app/dependencies.py"
    {!> ../../../docs_src/bigger_applications/app_an_py39/dependencies.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="1  5-7" title="app/dependencies.py"