Async http client/server framework (asyncio)
Project description
Async http client/server framework
Key Features
Supports both client and server side of HTTP protocol.
Supports both client and server Web-Sockets out-of-the-box without the Callback Hell.
Web-server has middlewares and pluggable routing.
Getting started
Client
To retrieve something from the web:
import aiohttp
import asyncio
import async_timeout
async def fetch(session, url):
async with async_timeout.timeout(10):
async with session.get(url) as response:
return await response.text()
async def main():
async with aiohttp.ClientSession() as session:
html = await fetch(session, 'http://python.org')
print(html)
if __name__ == '__main__':
loop = asyncio.get_event_loop()
loop.run_until_complete(main())Server
This is simple usage example:
from aiohttp import web
async def handle(request):
name = request.match_info.get('name', "Anonymous")
text = "Hello, " + name
return web.Response(text=text)
async def wshandle(request):
ws = web.WebSocketResponse()
await ws.prepare(request)
async for msg in ws:
if msg.type == web.MsgType.text:
await ws.send_str("Hello, {}".format(msg.data))
elif msg.type == web.MsgType.binary:
await ws.send_bytes(msg.data)
elif msg.type == web.MsgType.close:
break
return ws
app = web.Application()
app.add_routes([web.get('/', handle),
web.get('/echo', wshandle),
web.get('/{name}', handle)])
web.run_app(app)Documentation
External links
Feel free to make a Pull Request for adding your link to these pages!
Communication channels
aio-libs google group: https://groups.google.com/forum/#!forum/aio-libs
Feel free to post your questions and ideas here.
gitter chat https://gitter.im/aio-libs/Lobby
We support Stack Overflow. Please add aiohttp tag to your question there.
Requirements
Python >= 3.5.3
Optionally you may install the cChardet and aiodns libraries (highly recommended for sake of speed).
License
aiohttp is offered under the Apache 2 license.
Keepsafe
The aiohttp community would like to thank Keepsafe (https://www.getkeepsafe.com) for it’s support in the early days of the project.
Source code
The latest developer version is available in a github repository: https://github.com/aio-libs/aiohttp
Benchmarks
If you are interested in by efficiency, AsyncIO community maintains a list of benchmarks on the official wiki: https://github.com/python/asyncio/wiki/Benchmarks
Changelog
3.1.2 (2018-04-05)
Make LineTooLong exception more detailed about actual data size (#2863)
Call on_chunk_sent when write_eof takes as a param the last chunk (#2909)
3.1.1 (2018-03-27)
Support asynchronous iterators (and asynchronous generators as well) in both client and server API as request / response BODY payloads. (#2802)
3.1.0 (2018-03-21)
Welcome to aiohttp 3.1 release.
This is an incremental release, fully backward compatible with aiohttp 3.0.
But we have added several new features.
The most visible one is app.add_routes() (an alias for existing app.router.add_routes(). The addition is very important because all aiohttp docs now uses app.add_routes() call in code snippets. All your existing code still do register routes / resource without any warning but you’ve got the idea for a favorite way: noisy app.router.add_get() is replaced by app.add_routes().
The library does not make a preference between decorators:
routes = web.RouteTableDef()
@routes.get('/')
async def hello(request):
return web.Response(text="Hello, world")
app.add_routes(routes)
and route tables as a list:
async def hello(request):
return web.Response(text="Hello, world")
app.add_routes([web.get('/', hello)])
Both ways are equal, user may decide basing on own code taste.
Also we have a lot of minor features, bug fixes and documentation updates, see below.
Features
Relax JSON content-type checking in the ClientResponse.json() to allow “application/xxx+json” instead of strict “application/json”. (#2206)
Bump C HTTP parser to version 2.8 (#2730)
Accept a coroutine as an application factory in web.run_app and gunicorn worker. (#2739)
Implement application cleanup context (app.cleanup_ctx property). (#2747)
Make writer.write_headers a coroutine. (#2762)
Add tracking signals for getting request/response bodies. (#2767)
Deprecate ClientResponseError.code in favor of .status to keep similarity with response classes. (#2781)
Implement app.add_routes() method. (#2787)
Implement web.static() and RouteTableDef.static() API. (#2795)
Install a test event loop as default by asyncio.set_event_loop(). The change affects aiohttp test utils but backward compatibility is not broken for 99.99% of use cases. (#2804)
Refactor ClientResponse constructor: make logically required constructor arguments mandatory, drop _post_init() method. (#2820)
Use app.add_routes() in server docs everywhere (#2830)
Websockets refactoring, all websocket writer methods are converted into coroutines. (#2836)
Provide Content-Range header for Range requests (#2844)
Bugfixes
Fix websocket client return EofStream. (#2784)
Fix websocket demo. (#2789)
Property BaseRequest.http_range now returns a python-like slice when requesting the tail of the range. It’s now indicated by a negative value in range.start rather then in range.stop (#2805)
Close a connection if an unexpected exception occurs while sending a request (#2827)
Fix firing DNS tracing events. (#2841)
Improved Documentation
Change ClientResponse.json() documentation to reflect that it now allows “application/xxx+json” content-types (#2206)
Document behavior when cchardet detects encodings that are unknown to Python. (#2732)
Add diagrams for tracing request life style. (#2748)
Drop removed functionality for passing StreamReader as data at client side. (#2793)
Release history Release notifications | RSS feed
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