http client/server for asyncio
Features
Supports both client and server side of HTTP protocol.
Supports both client and server Web-Sockets out-of-the-box.
Web-server has middlewares and pluggable routing.
Getting started
Client
To retrieve something from the web:
import aiohttp
import asyncio
async def fetch(session, url):
with aiohttp.Timeout(10):
async with session.get(url) as response:
return await response.text()
if __name__ == '__main__':
loop = asyncio.get_event_loop()
with aiohttp.ClientSession(loop=loop) as session:
html = loop.run_until_complete(
fetch(session, 'http://python.org'))
print(html)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(body=text.encode('utf-8'))
async def wshandler(request):
ws = web.WebSocketResponse()
await ws.prepare(request)
async for msg in ws:
if msg.tp == web.MsgType.text:
ws.send_str("Hello, {}".format(msg.data))
elif msg.tp == web.MsgType.binary:
ws.send_bytes(msg.data)
elif msg.tp == web.MsgType.close:
break
return ws
app = web.Application()
app.router.add_route('GET', '/echo', wshandler)
app.router.add_route('GET', '/{name}', handle)
web.run_app(app)Note: examples are written for Python 3.5+ and utilize PEP-492 aka async/await. If you are using Python 3.4 please replace await with yield from and async def with @coroutine e.g.:
async def coro(...):
ret = await f()
shoud be replaced by:
@asyncio.coroutine
def coro(...):
ret = yield from f()
Documentation
Discussion list
aio-libs google group: https://groups.google.com/forum/#!forum/aio-libs
Requirements
Python >= 3.4.1
Optionally you may install cChardet library: https://pypi.python.org/pypi/cchardet/1.0.0
License
aiohttp is offered under the Apache 2 license.
Source code
The latest developer version is available in a github repository: https://github.com/KeepSafe/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
CHANGES
0.21.1 (02-10-2016)
Make new resources classes public #767
Add router.resources() view
Fix cmd-line parameter names in doc
0.21.0 (02-04-2016)
Introduce on_shutdown signal #722
Implement raw input headers #726
Implement web.run_app utility function #734
Introduce on_cleanup signal
Deprecate Application.finish() / Application.register_on_finish() in favor of on_cleanup.
Get rid of bare aiohttp.request(), aiohttp.get() and family in docs #729
Deprecate bare aiohttp.request(), aiohttp.get() and family #729
Refactor keep-alive support #737:
Enable keepalive for HTTP 1.0 by default
Disable it for HTTP 0.9 (who cares about 0.9, BTW?)
For keepalived connections
Send Connection: keep-alive for HTTP 1.0 only
don’t send Connection header for HTTP 1.1
For non-keepalived connections
Send Connection: close for HTTP 1.1 only
don’t send Connection header for HTTP 1.0
Add version parameter to ClientSession constructor, deprecate it for session.request() and family #736
Enable access log by default #735
Deprecate app.router.register_route() (the method was not documented intentionally BTW).
Deprecate app.router.named_routes() in favor of app.router.named_resources()
route.add_static accepts pathlib.Path now #743
Add command line support: $ python -m aiohttp.web package.main #740
FAQ section was added to docs. Enjoy and fill free to contribute new topics
Add async context manager support to ClientSession
Document ClientResponse’s host, method, url properties
Use CORK/NODELAY in client API #748
ClientSession.close and Connector.close are coroutines now
Close client connection on exception in ClientResponse.release()
Allow to read multipart parts without content-length specified #750
Add support for unix domain sockets to gunicorn worker #470
Add test for default Expect handler #601
Add the first demo project
Rename loader keyword argument in web.Request.json method. #646
Add local socket binding for TCPConnector #678
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