mirror of https://github.com/encode/starlette.git
143 lines
4.7 KiB
Markdown
143 lines
4.7 KiB
Markdown
<p align="center">
|
|
<picture>
|
|
<source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/encode/starlette/master/docs/img/starlette_dark.svg" width="420px">
|
|
<source media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/encode/starlette/master/docs/img/starlette.svg" width="420px">
|
|
<img alt="starlette-logo" src="https://raw.githubusercontent.com/encode/starlette/master/docs/img/starlette_dark.svg">
|
|
</picture>
|
|
</p>
|
|
|
|
<p align="center">
|
|
<em>✨ The little ASGI framework that shines. ✨</em>
|
|
</p>
|
|
|
|
---
|
|
|
|
[](https://github.com/encode/starlette/actions)
|
|
[](https://pypi.python.org/pypi/starlette)
|
|
[](https://pypi.org/project/starlette)
|
|
|
|
---
|
|
|
|
**Documentation**: <a href="https://www.starlette.io/" target="_blank">https://www.starlette.io</a>
|
|
|
|
**Source Code**: <a href="https://github.com/encode/starlette" target="_blank">https://github.com/encode/starlette</a>
|
|
|
|
---
|
|
|
|
# Starlette
|
|
|
|
Starlette is a lightweight [ASGI][asgi] framework/toolkit,
|
|
which is ideal for building async web services in Python.
|
|
|
|
It is production-ready, and gives you the following:
|
|
|
|
* A lightweight, low-complexity HTTP web framework.
|
|
* WebSocket support.
|
|
* In-process background tasks.
|
|
* Startup and shutdown events.
|
|
* Test client built on `httpx`.
|
|
* CORS, GZip, Static Files, Streaming responses.
|
|
* Session and Cookie support.
|
|
* 100% test coverage.
|
|
* 100% type annotated codebase.
|
|
* Few hard dependencies.
|
|
* Compatible with `asyncio` and `trio` backends.
|
|
* Great overall performance [against independent benchmarks][techempower].
|
|
|
|
## Installation
|
|
|
|
```shell
|
|
$ pip install starlette
|
|
```
|
|
|
|
You'll also want to install an ASGI server, such as [uvicorn](https://www.uvicorn.org/), [daphne](https://github.com/django/daphne/), or [hypercorn](https://hypercorn.readthedocs.io/en/latest/).
|
|
|
|
```shell
|
|
$ pip install uvicorn
|
|
```
|
|
|
|
## Example
|
|
|
|
```python title="example.py"
|
|
from starlette.applications import Starlette
|
|
from starlette.responses import JSONResponse
|
|
from starlette.routing import Route
|
|
|
|
|
|
async def homepage(request):
|
|
return JSONResponse({'hello': 'world'})
|
|
|
|
routes = [
|
|
Route("/", endpoint=homepage)
|
|
]
|
|
|
|
app = Starlette(debug=True, routes=routes)
|
|
```
|
|
|
|
Then run the application using Uvicorn:
|
|
|
|
```shell
|
|
$ uvicorn example:app
|
|
```
|
|
|
|
For a more complete example, see [encode/starlette-example](https://github.com/encode/starlette-example).
|
|
|
|
## Dependencies
|
|
|
|
Starlette only requires `anyio`, and the following are optional:
|
|
|
|
* [`httpx`][httpx] - Required if you want to use the `TestClient`.
|
|
* [`jinja2`][jinja2] - Required if you want to use `Jinja2Templates`.
|
|
* [`python-multipart`][python-multipart] - Required if you want to support form parsing, with `request.form()`.
|
|
* [`itsdangerous`][itsdangerous] - Required for `SessionMiddleware` support.
|
|
* [`pyyaml`][pyyaml] - Required for `SchemaGenerator` support.
|
|
|
|
You can install all of these with `pip install starlette[full]`.
|
|
|
|
## Framework or Toolkit
|
|
|
|
Starlette is designed to be used either as a complete framework, or as
|
|
an ASGI toolkit. You can use any of its components independently.
|
|
|
|
```python
|
|
from starlette.responses import PlainTextResponse
|
|
|
|
|
|
async def app(scope, receive, send):
|
|
assert scope['type'] == 'http'
|
|
response = PlainTextResponse('Hello, world!')
|
|
await response(scope, receive, send)
|
|
```
|
|
|
|
Run the `app` application in `example.py`:
|
|
|
|
```shell
|
|
$ uvicorn example:app
|
|
INFO: Started server process [11509]
|
|
INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
|
|
```
|
|
|
|
Run uvicorn with `--reload` to enable auto-reloading on code changes.
|
|
|
|
## Modularity
|
|
|
|
The modularity that Starlette is designed on promotes building re-usable
|
|
components that can be shared between any ASGI framework. This should enable
|
|
an ecosystem of shared middleware and mountable applications.
|
|
|
|
The clean API separation also means it's easier to understand each component
|
|
in isolation.
|
|
|
|
---
|
|
|
|
<p align="center"><i>Starlette is <a href="https://github.com/encode/starlette/blob/master/LICENSE.md">BSD licensed</a> code.<br/>Designed & crafted with care.</i></br>— ⭐️ —</p>
|
|
|
|
[asgi]: https://asgi.readthedocs.io/en/latest/
|
|
[httpx]: https://www.python-httpx.org/
|
|
[jinja2]: https://jinja.palletsprojects.com/
|
|
[python-multipart]: https://multipart.fastapiexpert.com/
|
|
[itsdangerous]: https://itsdangerous.palletsprojects.com/
|
|
[sqlalchemy]: https://www.sqlalchemy.org
|
|
[pyyaml]: https://pyyaml.org/wiki/PyYAMLDocumentation
|
|
[techempower]: https://www.techempower.com/benchmarks/#hw=ph&test=fortune&l=zijzen-sf
|