aiohttp 0.21.0

http client/server for asyncio

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

http://aiohttp.readthedocs.org/

Discussion list

aio-libs google group: https://groups.google.com/forum/#!forum/aio-libs

Requirements

• Python >= 3.4.1

• chardet https://pypi.python.org/pypi/chardet

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

0.21.0 (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