```Python hl_lines="1  3" title="app/routers/users.py"
{!../../../docs_src/bigger_applications/app/routers/users.py!}
```

### *Path operations* with `APIRouter`

And then you use it to declare your *path operations*.

Use it the same way you would use the `FastAPI` class:

```Python hl_lines="6  11  16" title="app/routers/users.py"
{!../../../docs_src/bigger_applications/app/routers/users.py!}
```

你可以导入它并通过与 `FastAPI` 类相同的方式创建一个「实例」：

```Python hl_lines="1  3" title="app/routers/users.py"
{!../../../docs_src/bigger_applications/app/routers/users.py!}
```

### 使用 `APIRouter` 的*路径操作*

然后你可以使用它来声明*路径操作*。

使用方式与 `FastAPI` 类相同：

```Python hl_lines="6  11  16" title="app/routers/users.py"
{!../../../docs_src/bigger_applications/app/routers/users.py!}
```

你可以将 `APIRouter` 视为一个「迷你 `FastAPI`」类。

所有相同的选项都得到支持。

            handler.formatter = MessageFormatter
            activeLogger.addHandler(handler)
          }
        }
      }
    }

    fun getLogger(name: String): Logger {
      val logger = Logger.getLogger(name)
      activeLoggers.add(logger)
      return logger
    }
  }

    * <a href="https://fastapi.tiangolo.com/tutorial/bigger-applications/" class="external-link" target="_blank">Tutorial - Bigger Applications</a>.

The client will get a **500 Internal Server Error** for that request, but the application will continue working for the next requests instead of just crashing completely.

### Bigger Errors - Crashes

Nevertheless, there might be cases where we write some code that **crashes the entire application** making Uvicorn and Python crash. 💥

COPY ./requirements.txt /app/requirements.txt

RUN pip install --no-cache-dir --upgrade -r /app/requirements.txt

COPY ./app /app
```

### 더 큰 어플리케이션

만약 여러분이 [다중 파일을 가지는 더 큰 어플리케이션](../tutorial/bigger-applications.md){.internal-link target=_blank}을 생성하는 섹션을 따랐다면, 여러분의 `Dockerfile`은 대신 이렇게 생겼을 것입니다:

```Dockerfile hl_lines="7"
FROM tiangolo/uvicorn-gunicorn-fastapi:python3.9

- github.com/Azure/go-autorest/autorest: [v0.11.29](https://github.com/Azure/go-autorest/tree/autorest/v0.11.29)
- github.com/Azure/go-autorest/logger: [v0.2.1](https://github.com/Azure/go-autorest/tree/logger/v0.2.1)
- github.com/Azure/go-autorest/tracing: [v0.6.0](https://github.com/Azure/go-autorest/tree/tracing/v0.6.0)

          if (!buffer.isProbablyUtf8()) {
            logger.log("")
            logger.log("<-- END HTTP (${totalMs}ms, binary ${buffer.size}-byte body omitted)")
            return response
          }

          if (contentLength != 0L) {
            logger.log("")
            logger.log(buffer.clone().readString(charset))
          }

          logger.log(
            buildString {

      protocol: ByteString,
      host: String,
      port: Int,
      maxAge: Long,
    ) {
      throw UnsupportedOperationException()
    }
  }

  companion object {
    private val logger = Logger.getLogger(MockHttp2Peer::class.java.name)
  }

And your **FastAPI** application might also be composed of several files/modules, etc.

### **FastAPI** app file

Let's say you have a file structure as described in [Bigger Applications](bigger-applications.md){.internal-link target=_blank}:

```
.
├── app
│   ├── __init__.py
│   └── main.py
```

In the file `main.py` you have your **FastAPI** app:


```Python