<div class="termy">

```console
$ pip install websockets

---> 100%
```

</div>

## WebSockets client { #websockets-client }

### In production { #in-production }

In your production system, you probably have a frontend created with a modern framework like React, Vue.js or Angular.

And to communicate using WebSockets with your backend you would probably use your frontend's utilities.

```

</div>

/// tip

For production you would use `fastapi run` instead of `fastapi dev`. 🚀

///

Internally, **FastAPI CLI** uses [Uvicorn](https://www.uvicorn.dev), a high-performance, production-ready, ASGI server. 😎

## About security, APIs, and docs { #about-security-apis-and-docs }

Hiding your documentation user interfaces in production *shouldn't* be the way to protect your API.

That doesn't add any extra security to your API, the *path operations* will still be available where they are.

If there's a security flaw in your code, it will still exist.

# About FastAPI versions { #about-fastapi-versions }

**FastAPI** is already being used in production in many applications and systems. And the test coverage is kept at 100%. But its development is still moving quickly.

New features are added frequently, bugs are fixed regularly, and the code is still continuously improving.

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> run <u style="text-decoration-style:solid">main.py</u>

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting production server 🚀

             Searching for package file structure from directories
             with <font color="#3465A4">__init__.py</font> files

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> run <u style="text-decoration-style:solid">main.py</u>

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting production server 🚀

             Searching for package file structure from directories
             with <font color="#3465A4">__init__.py</font> files

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> run <u style="text-decoration-style:solid">main.py</u>

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting production server 🚀

             Searching for package file structure from directories
             with <font color="#3465A4">__init__.py</font> files

  - 🤖 An automatically generated frontend client.
  - 🧪 [Playwright](https://playwright.dev) for End-to-End testing.
  - 🦇 Dark mode support.
- 🐋 [Docker Compose](https://www.docker.com) for development and production.
- 🔒 Secure password hashing by default.
- 🔑 JWT (JSON Web Token) authentication.
- 📫 Email based password recovery.
- ✅ Tests with [Pytest](https://pytest.org).

                props.setProperty(FessEnv.lasta_di_SMART_DEPLOY_MODE, "cool");
                props.setProperty(FessEnv.DEVELOPMENT_HERE, "false");
                props.setProperty(FessEnv.ENVIRONMENT_TITLE, "Production");
                props.setProperty(FessEnv.FRAMEWORK_DEBUG, "true");
                props.setProperty(FessEnv.TIME_ADJUST_TIME_MILLIS, "86400000");
                props.setProperty(FessEnv.MAIL_SEND_MOCK, "false");

"""FastAPI framework, high performance, easy to learn, fast to code, ready for production"""

__version__ = "0.135.3"

from starlette import status as status

from .applications import FastAPI as FastAPI
from .background import BackgroundTasks as BackgroundTasks
from .datastructures import UploadFile as UploadFile
from .exceptions import HTTPException as HTTPException
from .exceptions import WebSocketException as WebSocketException