### GET /

Source: https://fastapi.tiangolo.com/em/tutorial/first-steps

This endpoint provides a basic 'Hello World' message from the FastAPI application. It's the default root endpoint for demonstrating application functionality.

```APIDOC
## GET /

### Description
This endpoint serves as the root of the FastAPI application, returning a simple "Hello World" message. It demonstrates a basic HTTP GET request handler.

### Method
GET

### Endpoint
/

### Parameters
#### Path Parameters
No path parameters.

#### Query Parameters
No query parameters.

#### Request Body
No request body.

### Request Example
```json
{}
```

### Response
#### Success Response (200)
- **message** (string) - A greeting message.

#### Response Example
```json
{
  "message": "Hello World"
}
```
```

--------------------------------

### Create a Basic FastAPI Application

Source: https://fastapi.tiangolo.com/em/tutorial/first-steps

This Python code snippet demonstrates how to initialize a FastAPI application and define a simple asynchronous GET endpoint at the root path ('/'). It returns a JSON response with 'Hello World'. This code should be saved in a file like `main.py`.

```python
from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def root():
    return {"message": "Hello World"}

```

--------------------------------

### GET /

Source: https://fastapi.tiangolo.com/em/tutorial/first-steps

This endpoint serves as a basic health check or a root endpoint, returning a simple 'Hello World' message to confirm the application is running.

```APIDOC
## GET /

### Description
This endpoint returns a simple 'Hello World' message.

### Method
GET

### Endpoint
/

### Parameters
#### Path Parameters
(None)

#### Query Parameters
(None)

#### Request Body
(None)

### Request Example
(No request body required)

### Response
#### Success Response (200)
- **message** (string) - The greeting message.

#### Response Example
{
  "message": "Hello World"
}
```

--------------------------------

### Initialize FastAPI Application with Custom Name and Route

Source: https://fastapi.tiangolo.com/em/tutorial/first-steps

This Python example shows how to instantiate a FastAPI application with a custom variable name, `my_awesome_api`, instead of the default `app`. It also defines a basic GET route using this custom instance.

```python
from fastapi import FastAPI

my_awesome_api = FastAPI()


@my_awesome_api.get("/")
async def root():
    return {"message": "Hello World"}

```

--------------------------------

### Uvicorn Server Startup Output

Source: https://fastapi.tiangolo.com/em/tutorial/first-steps

This text snippet illustrates the typical console output when Uvicorn successfully starts a FastAPI application, indicating the local address where the server is accessible and confirming that the application has started.

```plaintext
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [28720]
INFO:     Started server process [28722]
INFO:     Waiting for application startup.
INFO:     Application startup complete.

```

```plaintext
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)

```

--------------------------------

### Example OpenAPI Specification (openapi.json)

Source: https://fastapi.tiangolo.com/em/tutorial/first-steps

This partial JSON code demonstrates the structure of the `openapi.json` file automatically generated by FastAPI. This file adheres to the OpenAPI specification, describing all API endpoints, their methods, responses, and data schemas, which powers interactive documentation like Swagger UI and ReDoc.

```json
{
    "openapi": "3.0.2",
    "info": {
        "title": "FastAPI",
        "version": "0.1.0"
    },
    "paths": {
        "/items/": {
            "get": {
                "responses": {
                    "200": {
                        "description": "Successful Response",
                        "content": {
                            "application/json": {



...

```

--------------------------------

### Run FastAPI Application with Uvicorn

Source: https://fastapi.tiangolo.com/em/tutorial/first-steps

This command line snippet shows how to run the FastAPI application using Uvicorn, a lightning-fast ASGI server. `main:app` refers to the `app` object within the `main.py` file, and `--reload` enables automatic server restart on code changes for development.

```bash
uvicorn main:app --reload

```

--------------------------------

### Run FastAPI Application (Custom Name) with Uvicorn

Source: https://fastapi.tiangolo.com/em/tutorial/first-steps

This shell command illustrates how to start a FastAPI application using Uvicorn when the application instance has a custom name, such as `my_awesome_api`. The Uvicorn command must explicitly reference this custom name to correctly load the application.

```shell
fast →uvicorn main:my_awesome_api --reload  
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)  
  
restart ↺
```

--------------------------------

### Run FastAPI Application (Default Name) with Uvicorn

Source: https://fastapi.tiangolo.com/em/tutorial/first-steps

This shell command demonstrates how to launch a FastAPI application named `app` located in `main.py` using Uvicorn. The `--reload` flag enables automatic code reloading on file changes during development.

```shell
fast →uvicorn main:app --reload  
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)  
  
restart ↺
```

--------------------------------

### Install Specific Python Package Version (Example 1)

Source: https://fastapi.tiangolo.com/em/virtual-environments

Illustrates installing a specific version of a package, `harry==1`, using `pip`. This example is part of a scenario demonstrating why global package installations can lead to version conflicts between different projects.

```shell
pip install "harry==1"
```

--------------------------------

### GET /

Source: https://fastapi.tiangolo.com/fr/tutorial/cors

An example GET endpoint demonstrating a basic FastAPI route within a CORS-configured application. It returns a simple 'Hello World' message.

```APIDOC
## GET /

### Description
A simple example endpoint that returns a "Hello World" message. This endpoint is part of the FastAPI application configured with CORSMiddleware.

### Method
GET

### Endpoint
/

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
```
GET /
```

### Response
#### Success Response (200)
- **message** (string) - A greeting message.

#### Response Example
```json
{
  "message": "Hello World"
}
```

```

--------------------------------

### Define FastAPI Route Operation Function (Synchronous)

Source: https://fastapi.tiangolo.com/em/tutorial/first-steps

This Python example shows a synchronous route operation function, `def root()`, that handles GET requests for the root path. FastAPI supports both `async def` and regular `def` functions for route handlers, allowing flexibility based on implementation needs.

```python
from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def root():
    return {"message": "Hello World"}

```

--------------------------------

### FastAPI Root Endpoint JSON Response

Source: https://fastapi.tiangolo.com/em/tutorial/first-steps

This JSON snippet shows the expected output when a client accesses the root endpoint (e.g., `http://127.0.0.1:8000/`) of the basic FastAPI application. It's a simple key-value pair.

```json
{"message": "Hello World"}

```

--------------------------------

### GET /items/

Source: https://fastapi.tiangolo.com/ja/reference/apirouter

Retrieves a list of example items. This endpoint demonstrates a basic GET request using FastAPI.

```APIDOC
## GET /items/\n\n### Description\nRetrieves a list of example items. This endpoint demonstrates a basic GET request using FastAPI.\n\n### Method\nGET\n\n### Endpoint\n/items/\n\n### Parameters\n#### Path Parameters\n(None)\n\n#### Query Parameters\n(None)\n\n#### Request Body\n(None)\n\n### Request Example\n(None)\n\n### Response\n#### Success Response (200)\n- **name** (string) - The name of the item.\n\n#### Response Example\n```json\n[\n  {\n    "name": "Empanada"\n  },\n  {\n    "name": "Arepa"\n  }\n]\n```
```

--------------------------------

### Install FastAPI with standard dependencies

Source: https://fastapi.tiangolo.com/em

This command installs the FastAPI library, including its standard dependencies. It provides the necessary components to start developing FastAPI applications, often encompassing an ASGI server like Uvicorn.

```bash
pip install "fastapi[standard]"
```

--------------------------------

### Serve Built Multilingual FastAPI Documentation (Python CLI)

Source: https://fastapi.tiangolo.com/de/contributing

This command-line script starts a simple local web server to preview the fully built multilingual FastAPI documentation. It serves the content from the `./site/` directory, which must have been generated by the `build-all` command. It is intended for final previewing rather than active development.

```bash
python ./scripts/docs.py serve
```

--------------------------------

### Install and Run FastAPI CLI in Development

Source: https://fastapi.tiangolo.com/fa/release-notes

This command-line example demonstrates how to install the FastAPI library using pip and then initiate a development server using the new `fastapi dev` command. The output provides server details, API documentation links, and indicates that file changes are being watched for live reloading.

```bash
$ pip install --upgrade fastapi

$ fastapi dev main.py


 ╭────────── FastAPI CLI - Development mode ───────────╮
 │                                                     │
 │  Serving at: http://127.0.0.1:8000                  │
 │                                                     │
 │  API docs: http://127.0.0.1:8000/docs               │
 │                                                     │
 │  Running in development mode, for production use:   │
 │                                                     │
 │  fastapi run                                        │
 │                                                     │
 ╰─────────────────────────────────────────────────────╯

INFO:     Will watch for changes in these directories: ['/home/user/code/awesomeapp']
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [2248755] using WatchFiles
INFO:     Started server process [2248757]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
```

--------------------------------

### GET /items/

Source: https://fastapi.tiangolo.com/tutorial/path-operation-configuration

Retrieves a list of available items. This is a basic example demonstrating a GET request.

```APIDOC
## GET /items/

### Description
Retrieves a list of available items.

### Method
GET

### Endpoint
/items/

### Parameters
#### Path Parameters
(None)

#### Query Parameters
(None)

#### Request Body
(None)

### Request Example
(None)

### Response
#### Success Response (200 OK)
- **name** (string) - The name of the item.
- **price** (float) - The price of the item.

#### Response Example
```json
[
  {
    "name": "Foo",
    "price": 42
  }
]
```
```

--------------------------------

### Run FastAPI development server with `fastapi dev`

Source: https://fastapi.tiangolo.com/fa/tutorial/first-steps

This command initiates the FastAPI development server, typically using `uvicorn` under the hood, to host the application defined in `main.py`. The console output displays server startup information, the local URL for the application and documentation, and indicates that the server is running in development mode with file watching enabled.

```shell
fast →fastapi dev _main.py_  
   FastAPI   Starting development server 🚀  
  
             Searching for package file structure from directories  
             with __init__.py files  
             Importing from /home/user/code/awesomeapp  
  
    module   🐍 main.py  
  
      code   Importing the FastAPI app object from the module with  
             the following code:  
  
             _from __**main**__ import __**app**_  
  
       app   Using import string: main:app  
  
    server   Server started at _http://127.0.0.1:8000_  
    server   Documentation at _http://127.0.0.1:8000/docs_  
  
       tip   Running in development mode, for production use:  
             **fastapi run**  
  
             Logs:  
  
      INFO   Will watch for changes in these directories:  
             **[**'/home/user/code/awesomeapp'**]**  
      INFO   Uvicorn running on _http://127.0.0.1:8000_ **(**Press CTRL+C  
             to quit**)**  
      INFO   Started reloader process **[****383138****]** using WatchFiles  
      INFO   Started server process **[****383153****]**  
      INFO   Waiting for application startup.  
      INFO   Application startup complete.  

restart ↻
```

--------------------------------

### Build Standard FastAPI Docker Image

Source: https://fastapi.tiangolo.com/em/deployment/docker

This Dockerfile example demonstrates how to build a standard Docker image for a FastAPI application. It uses the `tiangolo/uvicorn-gunicorn-fastapi` base image, copies `requirements.txt`, installs dependencies, and then copies the application code into the `/app` directory.

```Dockerfile
FROM tiangolo/uvicorn-gunicorn-fastapi:python3.9

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

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

COPY ./app /app

```

--------------------------------

### Create a Basic FastAPI App and Run Server (Python)

Source: https://fastapi.tiangolo.com/tutorial/first-steps

This snippet demonstrates the simplest FastAPI application. It imports the FastAPI class, creates an instance, and defines a root path operation that returns a JSON message. The associated command shows how to run this application using the FastAPI development server.

```python
from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def root():
    return {"message": "Hello World"}

```

```bash
fastapi dev main.py

```

--------------------------------

### Install and Run FastAPI CLI in Development Mode

Source: https://fastapi.tiangolo.com/uk/release-notes

This snippet demonstrates how to install the FastAPI framework and then run a Python application using the new FastAPI CLI in development mode. It showcases the command-line instructions to set up and execute a FastAPI application, including dependency installation via pip. The `fastapi dev` command starts a development server with live reloading.

```bash
$ pip install --upgrade fastapi

$ fastapi dev main.py
```

--------------------------------

### Run FastAPI Example Application using Uvicorn Development Server

Source: https://fastapi.tiangolo.com/de/contributing

This command starts a FastAPI application in development mode using Uvicorn. It specifies the Python file `tutorial001.py` as the entry point. The application will be served on port 8000, avoiding conflicts with the documentation server running on port 8008.

```bash
fast →fastapi dev tutorial001.py
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)

restart ↺
```

--------------------------------

### Test FastAPI WebSockets and HTTP Endpoints with TestClient

Source: https://fastapi.tiangolo.com/fa/advanced/testing-websockets

This Python example demonstrates how to use FastAPI's `TestClient` to write integration tests for both standard HTTP GET endpoints and WebSocket endpoints. It includes a minimal FastAPI application setup, a GET route, a WebSocket route, and two test functions showcasing how to interact with these endpoints using the `TestClient`.

```python
from fastapi import FastAPI
from fastapi.testclient import TestClient
from fastapi.websockets import WebSocket

app = FastAPI()


@app.get("/")
async def read_main():
    return {"msg": "Hello World"}


@app.websocket("/ws")
async def websocket(websocket: WebSocket):
    await websocket.accept()
    await websocket.send_json({"msg": "Hello WebSocket"})
    await websocket.close()


def test_read_main():
    client = TestClient(app)
    response = client.get("/")
    assert response.status_code == 200
    assert response.json() == {"msg": "Hello World"}


def test_websocket():
    client = TestClient(app)
    with client.websocket_connect("/ws") as websocket:
        data = websocket.receive_json()
        assert data == {"msg": "Hello WebSocket"}

```

--------------------------------

### GET /items/

Source: https://fastapi.tiangolo.com/tr/reference/apirouter

Retrieves a list of example items from the API. This endpoint demonstrates a basic GET request without any input parameters.

```APIDOC
## GET /items/

### Description
This endpoint retrieves a list of predefined items. It demonstrates a basic GET request in a FastAPI application.

### Method
GET

### Endpoint
/items/

### Parameters
None. This endpoint does not require any path, query, or request body parameters.

### Request Example
{}

### Response
#### Success Response (200)
- **name** (string) - The name of an item.

#### Response Example
```json
[
  {
    "name": "Empanada"
  },
  {
    "name": "Arepa"
  }
]
```
```

--------------------------------

### FastAPI GET Endpoint with Default Header Parameter (Partial)

Source: https://fastapi.tiangolo.com/tutorial/testing

This partial FastAPI code snippet illustrates an alternative method for defining a required header parameter, `x_token`, by assigning `Header()` as its default value, without using `Annotated`. It includes the same token validation and item retrieval logic for a `GET` endpoint. Note that the `POST` endpoint definition is incomplete in this example.

```python
from fastapi import FastAPI, Header, HTTPException
from pydantic import BaseModel

fake_secret_token = "coneofsilence"

fake_db = {
    "foo": {"id": "foo", "title": "Foo", "description": "There goes my hero"},
    "bar": {"id": "bar", "title": "Bar", "description": "The bartenders"}
}

app = FastAPI()


class Item(BaseModel):
    id: str
    title: str
    description: str | None = None


@app.get("/items/{item_id}", response_model=Item)
async def read_main(item_id: str, x_token: str = Header()):
    if x_token != fake_secret_token:
        raise HTTPException(status_code=400, detail="Invalid X-Token header")
    if item_id not in fake_db:
        raise HTTPException(status_code=404, detail="Item not found")
    return fake_db[item_id]


@app.post("/items/", response_model=Item)
```

--------------------------------

### Run FastAPI Development Server from Documentation Examples

Source: https://fastapi.tiangolo.com/fr/contributing

This command demonstrates how to run a FastAPI application directly from a documentation example file using the `fastapi dev` command. The output shows the Uvicorn server starting on port 8000, which by default avoids port clashes with the documentation server (typically on 8008).

```shell
fast →fastapi dev tutorial001.py
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
  
restart ↻
```

--------------------------------

### Serve FastAPI Docs Locally Using MkDocs for a Specific Language

Source: https://fastapi.tiangolo.com/fa/contributing

These commands provide an alternative, manual method to serve the documentation for a specific language. First, navigate into the target language's documentation directory, then use `mkdocs serve` to start a local development server. This method requires `mkdocs` to be installed and accessible in your environment, providing a live preview at the specified address.

```bash
cd docs/es/
```

```bash
mkdocs serve --dev-addr 127.0.0.1:8008
```

--------------------------------

### GET /items/

Source: https://fastapi.tiangolo.com/pt/reference/fastapi

Defines an HTTP GET endpoint to retrieve a list of items. This example illustrates a simple GET request returning a static list of items.

```APIDOC
## GET /items/

### Description
Defines an HTTP GET endpoint to retrieve a list of items.

### Method
GET

### Endpoint
/items/

### Parameters
#### Path Parameters
_None_

#### Query Parameters
_None_

#### Request Body
_None_

### Request Example
_None_

### Response
#### Success Response (200)
- **name** (string) - The name of an item.

#### Response Example
```json
[
  {
    "name": "Empanada"
  },
  {
    "name": "Arepa"
  }
]
```
```

--------------------------------

### Run FastAPI application using the Uvicorn development server

Source: https://fastapi.tiangolo.com/fa/contributing

This shell command demonstrates how to run a FastAPI application file, `tutorial001.py`, using the `fastapi dev` command. It initializes Uvicorn, which serves the application on `http://127.0.0.1:8000` by default. This setup allows developers to run documentation examples and ensures port compatibility with the documentation server.

```shell
fastapi dev tutorial001.py
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

--------------------------------

### Serve compiled FastAPI documentation locally

Source: https://fastapi.tiangolo.com/contributing

Serves the fully built FastAPI documentation locally for preview. After running `build-all`, the command `python ./scripts/docs.py serve` launches a simple HTTP server, typically accessible at `http://127.0.0.1:8008`. This allows developers to review the combined, multi-language documentation as it would appear online.

```bash
python ./scripts/docs.py serve
```

--------------------------------

### Manually Serve FastAPI Docs Live for Existing Language (Bash & MkDocs)

Source: https://fastapi.tiangolo.com/ko/contributing

As an alternative to the script, these commands manually set up and serve the FastAPI documentation for a specific language. First, change the directory to the language's documentation folder (e.g., `docs/es/`), then run `mkdocs serve` to start the local development server.

```bash
cd docs/es/
```

```bash
mkdocs serve --dev-addr 127.0.0.1:8008
```

--------------------------------

### GET /items/

Source: https://fastapi.tiangolo.com/fr/reference/fastapi

Defines an API endpoint for an HTTP GET request to retrieve a list of items. This example demonstrates a basic GET operation without any path or query parameters.

```APIDOC
## GET /items/

### Description
Retrieves a list of sample items (Empanada, Arepa).

### Method
GET

### Endpoint
/items/

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
GET requests typically do not have a request body.

### Response
#### Success Response (200)
- **array** (list of objects) - A list of item objects.

#### Response Example
```json
[
  {
    "name": "Empanada"
  },
  {
    "name": "Arepa"
  }
]
```
```

--------------------------------

### GET /items/ (Example with Depends)

Source: https://fastapi.tiangolo.com/ru/reference/dependencies

Example API endpoint demonstrating how to use `fastapi.Depends` to inject common query parameters into a path operation.

```APIDOC
## GET /items/

### Description
Retrieves a list of items with optional filtering, skipping, and limiting. This endpoint showcases the use of `fastapi.Depends` to manage common query parameters for reusability.

### Method
GET

### Endpoint
/items/

### Parameters
#### Query Parameters
- **q** (str) - Optional - A search query string for filtering items.
- **skip** (int) - Optional - The number of items to skip from the beginning of the list. Default: 0.
- **limit** (int) - Optional - The maximum number of items to return in the response. Default: 100.

### Request Example
(No request body for GET requests)

### Response
#### Success Response (200)
- **q** (str) - The query string used for filtering.
- **skip** (int) - The number of skipped items.
- **limit** (int) - The maximum number of returned items.

#### Response Example
```json
{
  "q": "example_query_string",
  "skip": 0,
  "limit": 100
}
```
```

--------------------------------

### Serve FastAPI Documentation Live Using Python Script

Source: https://fastapi.tiangolo.com/ru/contributing

Use this Python script to build and serve the FastAPI documentation locally. It enables live-reloading, allowing you to see changes instantly as you edit documentation or source files. The documentation will be available at `http://127.0.0.1:8008`.

```bash
python ./scripts/docs.py live
```

--------------------------------

### GET /users/

Source: https://fastapi.tiangolo.com/vi/tutorial/path-operation-configuration

Retrieves a list of users. This endpoint is part of an example demonstrating basic GET requests.

```APIDOC
## GET /users/

### Description
Retrieves a list of users.

### Method
GET

### Endpoint
/users/

### Parameters
None

### Request Example
None

### Response
#### Success Response (200)
- **username** (string) - The username.

#### Response Example
```json
[
  {
    "username": "johndoe"
  }
]
```
```

--------------------------------

### GET /status/ - Get System Status

Source: https://fastapi.tiangolo.com/zh/advanced/security/oauth2-scopes

Checks and returns the current operational status of the system. Requires authentication.

```APIDOC
## GET /status/

### Description
Provides a simple check for the system's operational status. This endpoint requires a valid access token for authentication, but no specific scopes are enforced beyond general user authentication.

### Method
GET

### Endpoint
/status/

### Parameters
#### Request Headers
- **Authorization** (string) - Required - Bearer token (e.g., `Bearer <access_token>`).

### Request Example
```
GET /status/
Authorization: Bearer <access_token>
```

### Response
#### Success Response (200)
- **status** (string) - A string indicating the system's health, typically "ok".

#### Error Response (401)
- **detail** (string) - "Could not validate credentials"

### Response Example
```json
{
  "status": "ok"
}
```
```

--------------------------------

### GET /items/

Source: https://fastapi.tiangolo.com/ru/reference/fastapi

Retrieves a list of predefined items. This example illustrates a simple GET path operation in FastAPI.

```APIDOC
## GET /items/

### Description
Retrieves a list of predefined items. This example illustrates a simple GET path operation in FastAPI.

### Method
GET

### Endpoint
/items/

### Request Example
(No request body for this GET endpoint)

### Response
#### Success Response (200)
- **name** (string) - The name of the item.

#### Response Example
```json
[
  {
    "name": "Empanada"
  },
  {
    "name": "Arepa"
  }
]
```
```

--------------------------------

### Install Specific Python Package Version (Example 2)

Source: https://fastapi.tiangolo.com/em/virtual-environments

Shows installing another specific version of the `harry` package, `harry==3`, using `pip`. This command, following an installation of `harry==1`, highlights the problem of managing conflicting dependencies in a global Python environment.

```shell
pip install "harry==3"
```

--------------------------------

### GET /items/

Source: https://fastapi.tiangolo.com/reference/apirouter

Retrieves a list of predefined items. This example demonstrates a basic GET request with a hardcoded response.

```APIDOC
## GET /items/

### Description
Retrieves a list of predefined items from the server. This endpoint serves as a basic example of a GET request in FastAPI, returning a static array of item objects.

### Method
GET

### Endpoint
/items/

### Parameters
(None)

### Request Example
(No request body)

### Response
#### Success Response (200)
- **array of objects** - A list containing item objects.
  - **name** (string) - The name of the item.

#### Response Example
```json
[
  {
    "name": "Empanada"
  },
  {
    "name": "Arepa"
  }
]
```
```

--------------------------------

### Run FastAPI Application with Uvicorn Development Server

Source: https://fastapi.tiangolo.com/advanced/websockets

This command demonstrates how to start the FastAPI application using the `fastapi dev` command, which internally uses Uvicorn. It specifies `main.py` as the application entry point, enabling automatic reloading during development. The server will be accessible at `http://127.0.0.1:8000`.

```shell
fast →fastapi dev main.py
```

--------------------------------

### FastAPI Application Setup and Imports (Python)

Source: https://fastapi.tiangolo.com/de/advanced/websockets

Initializes the FastAPI application and imports necessary modules for handling HTTP responses, WebSockets, cookies, query parameters, and dependency injection. This sets up the core framework for the server-side logic.

```python
from typing import Union

from fastapi import (
    Cookie,
    Depends,
    FastAPI,
    Query,
    WebSocket,
    WebSocketException,
    status,
)
from fastapi.responses import HTMLResponse

app = FastAPI()
```

--------------------------------

### GET /items/

Source: https://fastapi.tiangolo.com/vi/reference/apirouter

Defines an API endpoint that handles HTTP GET requests to retrieve a collection of items. This example demonstrates a simple GET operation without any request parameters.

```APIDOC
## GET /items/

### Description
Retrieves a list of items from the server. This endpoint does not require any request parameters.

### Method
GET

### Endpoint
/items/

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
{}

### Response
#### Success Response (200)
- **(array<object>)** - A list of item objects.
  - **name** (string) - The name of the item.

#### Response Example
[
  {
    "name": "Empanada"
  },
  {
    "name": "Arepa"
  }
]
```

--------------------------------

### GET /status/ - Get System Status

Source: https://fastapi.tiangolo.com/zh/advanced/security/oauth2-scopes

Checks the system status. Requires basic authentication to ensure the user exists.

```APIDOC
## GET /status/

### Description
This endpoint provides a basic system status check. It requires any authenticated user to access, though no specific scopes are enforced beyond successful authentication.

### Method
GET

### Endpoint
/status/

### Parameters
#### Request Headers
- **Authorization** (string) - Required - Bearer token (e.g., `Bearer <access_token>`)

### Request Example
(No request body)

### Response
#### Success Response (200)
- **status** (string) - A simple status message.
- **user** (string) - The username of the authenticated user.

#### Response Example
```json
{
  "status": "System Operational",
  "user": "johndoe"
}
```

#### Error Response (401)
- **detail** (string) - Error message, e.g., "Could not validate credentials".

#### Error Example
```json
{
  "detail": "Could not validate credentials"
}
```
```

--------------------------------

### GET /items/

Source: https://fastapi.tiangolo.com/fr/reference/apirouter

Defines a path operation for retrieving a list of items using an HTTP GET request. This example demonstrates a basic GET endpoint returning static data.

```APIDOC
## GET /items/

### Description
Retrieves a list of predefined items. This endpoint is defined using FastAPI's `@router.get()` decorator.

### Method
GET

### Endpoint
/items/

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
```json
{}
```

### Response
#### Success Response (200)
- **name** (string) - The name of an item.

#### Response Example
```json
[
  {
    "name": "Empanada"
  },
  {
    "name": "Arepa"
  }
]
```
```

--------------------------------

### Run Traefik Proxy with Custom Configuration

Source: https://fastapi.tiangolo.com/fa/advanced/behind-a-proxy

This command demonstrates how to start the Traefik proxy using a specific configuration file (`traefik.toml`). It initializes Traefik to listen for incoming requests and apply the defined routing and middleware rules.

```bash
fast →./traefik --configFile=traefik.toml  
INFO[0000] Configuration loaded from file: /home/user/awesomeapi/traefik.toml  
  
restart ↻
```

--------------------------------

### Serve FastAPI Documentation Manually with mkdocs

Source: https://fastapi.tiangolo.com/ko/contributing

As an alternative to the Python script, you can manually serve the documentation by navigating to the language-specific docs directory (e.g., `docs/en/`) and running `mkdocs serve`. This command starts a local server to display the documentation at the specified address.

```bash
cd docs/en/
mkdocs serve --dev-addr 127.0.0.1:8008
```

--------------------------------

### GET /items/ (Initial Example)

Source: https://fastapi.tiangolo.com/tr/tutorial/path-operation-configuration

Retrieve a list of items. This endpoint demonstrates a basic GET operation returning a predefined list of item objects with name and price.

```APIDOC
## GET /items/

### Description
Retrieve a list of items. This endpoint demonstrates a basic GET operation returning a predefined list of item objects with name and price.

### Method
GET

### Endpoint
/items/

### Parameters
#### Path Parameters
_None_

#### Query Parameters
_None_

#### Request Body
_None_

### Request Example
_None_

### Response
#### Success Response (200)
- **name** (string) - The name of an item.
- **price** (number) - The price of an item.

#### Response Example
```json
[
  {
    "name": "Foo",
    "price": 42
  }
]
```
```

--------------------------------

### GET /items/

Source: https://fastapi.tiangolo.com/vi/tutorial/path-operation-configuration

Retrieves a list of available items. This endpoint is part of an example demonstrating basic GET requests.

```APIDOC
## GET /items/

### Description
Retrieves a list of available items.

### Method
GET

### Endpoint
/items/

### Parameters
None

### Request Example
None

### Response
#### Success Response (200)
- **name** (string) - The name of the item.
- **price** (float) - The price of the item.

#### Response Example
```json
[
  {
    "name": "Foo",
    "price": 42
  }
]
```
```

--------------------------------

### GET /users/

Source: https://fastapi.tiangolo.com/zh/reference/apirouter

Retrieves a list of example user data from the application.

```APIDOC
## GET /users/

### Description
Retrieves a list of user objects, each containing a name. This endpoint is defined within a `users_router` and is accessible through the main application via an `internal_router`.

### Method
GET

### Endpoint
/users/

### Parameters
#### Path Parameters
- No path parameters.

#### Query Parameters
- No query parameters.

#### Request Body
- No request body.

### Request Example
No request body is required for this endpoint.

### Response
#### Success Response (200)
- **name** (string) - The name of the user.

#### Response Example
```json
[
  {
    "name": "Rick"
  },
  {
    "name": "Morty"
  }
]
```
```

--------------------------------

### FastAPI Protected Endpoint to Read System Status

Source: https://fastapi.tiangolo.com/zh/advanced/security/oauth2-scopes

This GET endpoint (`/status/`) provides an example of a simple protected route that only requires

--------------------------------

### GET /users/

Source: https://fastapi.tiangolo.com/tutorial/path-operation-configuration

Retrieves a list of registered users. This is a basic example demonstrating a GET request for user data.

```APIDOC
## GET /users/

### Description
Retrieves a list of registered users.

### Method
GET

### Endpoint
/users/

### Parameters
#### Path Parameters
(None)

#### Query Parameters
(None)

#### Request Body
(None)

### Request Example
(None)

### Response
#### Success Response (200 OK)
- **username** (string) - The username of the user.

#### Response Example
```json
[
  {
    "username": "johndoe"
  }
]
```
```

--------------------------------

### POST /users/

Source: https://fastapi.tiangolo.com/fr/advanced/generate-clients

Creates a new user with a username and email, demonstrating another POST operation.

```APIDOC
## POST /users/

### Description
Creates a new user with a username and email.

### Method
POST

### Endpoint
/users/

### Parameters
#### Request Body
- **username** (string) - Required - The username of the new user.
- **email** (string) - Required - The email address of the new user.

### Request Example
{
  "username": "john_doe",
  "email": "john.doe@example.com"
}

### Response
#### Success Response (200)
- **message** (string) - A confirmation message indicating the user was received.

#### Response Example
{
  "message": "User received"
}
```

--------------------------------

### GET /

Source: https://fastapi.tiangolo.com/fr/advanced/websockets

This endpoint serves the main HTML page for the WebSocket chat application. It's a standard GET request that returns static HTML content.

```APIDOC
## GET /

### Description
This endpoint serves the main HTML page for the WebSocket chat application. It provides the front-end interface for users to connect to the WebSocket and send messages.

### Method
GET

### Endpoint
/

### Parameters
#### Path Parameters
N/A

#### Query Parameters
N/A

#### Request Body
N/A

### Request Example
N/A

### Response
#### Success Response (200)
Returns an HTML page for the chat application.

#### Response Example
```html
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <form action="" onsubmit="sendMessage(event)">
            <label>Item ID: <input type="text" id="itemId" autocomplete="off" value="foo"/></label>
            <label>Token: <input type="text" id="token" autocomplete="off" value="some-key-token"/></label>
            <button onclick="connect(event)">Connect</button>
            <hr>
            <label>Message: <input type="text" id="messageText" autocomplete="off"/></label>
            <button>Send</button>
        </form>
        <ul id='messages'>
        </ul>
        <script>
            // ... (JavaScript for WebSocket client handling)
        </script>
    </body>
</html>
```
```

--------------------------------

### Serve MkDocs Manually for a Specific Language (Shell)

Source: https://fastapi.tiangolo.com/ja/contributing

Manually start the MkDocs development server from within a language's directory. This serves the documentation locally, typically on port 8008, allowing you to preview translated content.

```bash
mkdocs serve --dev-addr 127.0.0.1:8008
```

--------------------------------

### FastAPI JWT Authentication Setup: Constants, Models, and Dependencies

Source: https://fastapi.tiangolo.com/tutorial/security/oauth2-jwt

Defines all necessary imports, security constants (SECRET_KEY, ALGORITHM, ACCESS_TOKEN_EXPIRE_MINUTES), a mock user database, Pydantic models for request/response bodies and internal user representation, and initializes FastAPI security components and the app instance.

```python
from datetime import datetime, timedelta, timezone
from typing import Annotated, Union

import jwt
from fastapi import Depends, FastAPI, HTTPException, status
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from jwt.exceptions import InvalidTokenError
from pwdlib import PasswordHash
from pydantic import BaseModel

SECRET_KEY = "09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7"
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 30


fake_users_db = {
    "johndoe": {
        "username": "johndoe",
        "full_name": "John Doe",
        "email": "johndoe@example.com",
        "hashed_password": "$argon2id$v=19$m=65536,t=3,p=4$wagCPXjifgvUFBzq4hqe3w$CYaIb8sB+wtD+Vu/P4uod1+Qof8h+1g7bbDlBID48Rc",
        "disabled": False,
    }
}


class Token(BaseModel):
    access_token: str
    token_type: str


class TokenData(BaseModel):
    username: Union[str, None] = None


class User(BaseModel):
    username: str
    email: Union[str, None] = None
    full_name: Union[str, None] = None
    disabled: Union[bool, None] = None


class UserInDB(User):
    hashed_password: str


password_hash = PasswordHash.recommended()

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

app = FastAPI()
```

--------------------------------

### FastAPI Endpoints with Annotated Header and Error Handling

Source: https://fastapi.tiangolo.com/tutorial/testing

This FastAPI application defines `GET` and `POST` endpoints that require an `X-Token` header, validated using `Annotated`. It handles common errors like invalid tokens, non-existent items for GET requests, and conflicts for POST requests by raising `HTTPException`. The example includes variations for Python 3.10+ (`str | None`) and Python 3.9/3.8 (`Union[str, None]` with or without `typing_extensions.Annotated`) for Pydantic model type hints.

```python
from typing import Annotated

from fastapi import FastAPI, Header, HTTPException
from pydantic import BaseModel

fake_secret_token = "coneofsilence"

fake_db = {
    "foo": {"id": "foo", "title": "Foo", "description": "There goes my hero"},
    "bar": {"id": "bar", "title": "Bar", "description": "The bartenders"}
}

app = FastAPI()


class Item(BaseModel):
    id: str
    title: str
    description: str | None = None


@app.get("/items/{item_id}", response_model=Item)
async def read_main(item_id: str, x_token: Annotated[str, Header()]):
    if x_token != fake_secret_token:
        raise HTTPException(status_code=400, detail="Invalid X-Token header")
    if item_id not in fake_db:
        raise HTTPException(status_code=404, detail="Item not found")
    return fake_db[item_id]


@app.post("/items/", response_model=Item)
async def create_item(item: Item, x_token: Annotated[str, Header()]):
    if x_token != fake_secret_token:
        raise HTTPException(status_code=400, detail="Invalid X-Token header")
    if item.id in fake_db:
        raise HTTPException(status_code=409, detail="Item already exists")
    fake_db[item.id] = item
    return item
```

```python
from typing import Annotated, Union

from fastapi import FastAPI, Header, HTTPException
from pydantic import BaseModel

fake_secret_token = "coneofsilence"

fake_db = {
    "foo": {"id": "foo", "title": "Foo", "description": "There goes my hero"},
    "bar": {"id": "bar", "title": "Bar", "description": "The bartenders"}
}

app = FastAPI()


class Item(BaseModel):
    id: str
    title: str
    description: Union[str, None] = None


@app.get("/items/{item_id}", response_model=Item)
async def read_main(item_id: str, x_token: Annotated[str, Header()]):
    if x_token != fake_secret_token:
        raise HTTPException(status_code=400, detail="Invalid X-Token header")
    if item_id not in fake_db:
        raise HTTPException(status_code=404, detail="Item not found")
    return fake_db[item_id]


@app.post("/items/", response_model=Item)
async def create_item(item: Item, x_token: Annotated[str, Header()]):
    if x_token != fake_secret_token:
        raise HTTPException(status_code=400, detail="Invalid X-Token header")
    if item.id in fake_db:
        raise HTTPException(status_code=409, detail="Item already exists")
    fake_db[item.id] = item
    return item
```

```python
from typing import Union

from fastapi import FastAPI, Header, HTTPException
from pydantic import BaseModel
from typing_extensions import Annotated

fake_secret_token = "coneofsilence"

fake_db = {
    "foo": {"id": "foo", "title": "Foo", "description": "There goes my hero"},
    "bar": {"id": "bar", "title": "Bar", "description": "The bartenders"}
}

app = FastAPI()


class Item(BaseModel):
    id: str
    title: str
    description: Union[str, None] = None


@app.get("/items/{item_id}", response_model=Item)
async def read_main(item_id: str, x_token: Annotated[str, Header()]):
    if x_token != fake_secret_token:
        raise HTTPException(status_code=400, detail="Invalid X-Token header")
    if item_id not in fake_db:
        raise HTTPException(status_code=404, detail="Item not found")
    return fake_db[item_id]


@app.post("/items/", response_model=Item)
async def create_item(item: Item, x_token: Annotated[str, Header()]):
    if x_token != fake_secret_token:
        raise HTTPException(status_code=400, detail="Invalid X-Token header")
    if item.id in fake_db:
        raise HTTPException(status_code=409, detail="Item already exists")
    fake_db[item.id] = item
    return item
```

--------------------------------

### GET /users/me/items/ - Get User's Items

Source: https://fastapi.tiangolo.com/tr/tutorial/security/oauth2-jwt

Retrieves a list of items owned by the currently authenticated and active user. This is an example of accessing a protected resource.

```APIDOC
## GET /users/me/items/

### Description
Fetches a list of items belonging to the current active user. This endpoint demonstrates accessing a resource protected by authentication.

### Method
GET

### Endpoint
/users/me/items/

### Parameters
#### Headers
- **Authorization** (string) - Required - Bearer token received from the /token endpoint.

### Request Example
No request body.
```
Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...
```

### Response
#### Success Response (200 OK)
- **item_id** (string) - The unique identifier of the item.
- **owner** (string) - The username of the item's owner.

#### Response Example
```json
[
  {
    "item_id": "Foo",
    "owner": "johndoe"
  }
]
```

#### Error Response (401 Unauthorized)
- If no token is provided or the token is invalid.

#### Response Example (401)
```json
{
  "detail": "Could not validate credentials"
}
```

#### Error Response (400 Bad Request)
- If the authenticated user is disabled.

#### Response Example (400)
```json
{
  "detail": "Inactive user"
}
```
```

--------------------------------

### POST /items/

Source: https://fastapi.tiangolo.com/fr/advanced/generate-clients

Creates a new item with a name and price, demonstrating a POST operation.

```APIDOC
## POST /items/

### Description
Creates a new item with a name and price.

### Method
POST

### Endpoint
/items/

### Parameters
#### Request Body
- **name** (string) - Required - The name of the item.
- **price** (number) - Required - The price of the item.

### Request Example
{
  "name": "New Item",
  "price": 10.99
}

### Response
#### Success Response (200)
- **message** (string) - A confirmation message indicating the item was received.

#### Response Example
{
  "message": "Item received"
}
```

--------------------------------

### Serve FastAPI Docs Live for Existing Language (Python)

Source: https://fastapi.tiangolo.com/em/contributing

This command uses a Python script to start a local development server for FastAPI documentation. It allows previewing translated content for an existing language, specified by its two-letter code (e.g., 'es'). The server runs on http://127.0.0.1:8008 and watches for file changes.

```python
python ./scripts/docs.py live es
```