```

</div>

/// note

The command `uvicorn main:app` refers to:

* `main`: the file `main.py` (the Python "module").
* `app`: the object created inside of `main.py` with the line `app = FastAPI()`.

It is equivalent to:

```Python
from main import app
```

///

{*../../docs_src/websockets/tutorial001.py hl[48:52]*}

Você pode receber e enviar dados binários, de texto e JSON.

## Tente você mesmo

Se seu arquivo for nomeado `main.py`, execute sua aplicação com:

<div class="termy">

```console
$ fastapi dev main.py

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

1.93725rem;\n  padding: 0.35rem 1rem;\n}\n\n.text-sm .main-header .nav-link > .fa,\n.text-sm .main-header .nav-link > .fas,\n.text-sm .main-header .nav-link > .far,\n.text-sm .main-header .nav-link > .fab,\n.text-sm .main-header .nav-link > .fal,\n.text-sm .main-header .nav-link > .fad,\n.text-sm .main-header .nav-link > .svg-inline--fa,\n.text-sm .main-header .nav-link > .ion, .main-header.text-sm .nav-link > .fa,\n.main-header.text-sm .nav-link > .fas,\n.main-header.text-sm .nav-link > .far,\n.main-header.text-sm...

```Python hl_lines="1  3  7" title="app/main.py"
{!../../docs_src/bigger_applications/app/main.py!}
```

### Den `APIRouter` importieren

Jetzt importieren wir die anderen Submodule, die `APIRouter` haben:

```Python hl_lines="4-5" title="app/main.py"
{!../../docs_src/bigger_applications/app/main.py!}
```

With **FastAPI** you can take advantage of concurrency that is very common for web development (the same main attraction of NodeJS).

But you can also exploit the benefits of parallelism and multiprocessing (having multiple processes running in parallel) for **CPU bound** workloads like those in Machine Learning systems.

            .header("Content-Type", "text/plain-ish")
            .build(),
        )
      }
    server.enqueue(MockResponse())
    client.newCall(
      request()
        .post("Hi?".toRequestBody(PLAIN))
        .build(),
    ).execute()
    applicationLogs
      .assertLogEqual("--> POST $url")
      .assertLogEqual("Content-Type: text/plain; charset=utf-8")
      .assertLogEqual("Content-Length: 3")

# (1)
COPY ./main.py /code/

# (2)
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "80"]
```

1️⃣. 📁 `main.py` 📁 `/code` 📁 🔗 (🍵 🙆 `./app` 📁).

2️⃣. 🏃 Uvicorn & 💬 ⚫️ 🗄 `app` 🎚 ⚪️➡️ `main` (↩️ 🏭 ⚪️➡️ `app.main`).

⤴️ 🔆 Uvicorn 📋 ⚙️ 🆕 🕹 `main` ↩️ `app.main` 🗄 FastAPI 🎚 `app`.

## 🛠️ 🔧

                        "description": "Successful Response",
                        "content": {"application/json": {"schema": {}}},
                    }
                },
                "summary": "Read Main",
                "operationId": "read_main_app_get",
            }
        }
    },
}
openapi_schema_sub = {
    "openapi": "3.1.0",
    "info": {"title": "FastAPI", "version": "0.1.0"},
    "paths": {

#                                                     ------
# Does it send mock mail? (true: no send actually, logging only)
mail.send.mock = false

# SMTP server settings for main: host:port
mail.smtp.server.main.host.and.port = localhost:25

# The prefix of subject to show test environment or not
mail.subject.test.prefix = 

# The common return path of all mail
mail.return.path = root@localhost

#                                                     ------
# Does it send mock mail? (true: no send actually, logging only)
mail.send.mock = false

# SMTP server settings for main: host:port
mail.smtp.server.main.host.and.port = localhost:25

# The prefix of subject to show test environment or not
mail.subject.test.prefix = 

# The common return path of all mail
mail.return.path = root@localhost