aiohttp 1.3.1

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, loop=session.loop):
        async with session.get(url) as response:
            return await response.text()

async def main(loop):
    async with aiohttp.ClientSession(loop=loop) as session:
        html = await fetch(session, 'http://python.org')
        print(html)

if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main(loop))

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 wshandler(request):
    ws = web.WebSocketResponse()
    await ws.prepare(request)

    async for msg in ws:
        if msg.type == web.MsgType.text:
            ws.send_str("Hello, {}".format(msg.data))
        elif msg.type == web.MsgType.binary:
            ws.send_bytes(msg.data)
        elif msg.type == web.MsgType.close:
            break

    return ws


app = web.Application()
app.router.add_get('/echo', wshandler)
app.router.add_get('/', handle)
app.router.add_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()

should be replaced by:

@asyncio.coroutine
def coro(...):
    ret = yield from f()

Documentation

https://aiohttp.readthedocs.io/

Discussion list

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

Requirements

• Python >= 3.4.2
• async-timeout
• chardet
• multidict
• yarl

Optionally you may install the cChardet and aiodns libraries (highly recommended for sake of speed).

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

1.3.1 (2017-02-09)

• Handle CLOSING in WebSocketResponse.__anext__
• Fixed AttributeError ‘drain’ for server websocket handler #1613

1.3.0 (2017-02-08)

• Multipart writer validates the data on append instead of on a request send #920
• Multipart reader accepts multipart messages with or without their epilogue to consistently handle valid and legacy behaviors #1526 #1581
• Separate read + connect + request timeouts # 1523
• Do not swallow Upgrade header #1587
• Fix polls demo run application #1487
• Ignore unknown 1XX status codes in client #1353
• Fix sub-Multipart messages missing their headers on serialization #1525
• Do not use readline when reading the content of a part in the multipart reader #1535
• Add optional flag for quoting FormData fields #916
• 416 Range Not Satisfiable if requested range end > file size #1588
• Having a : or @ in a route does not work #1552
• Added receive_timeout timeout for websocket to receive complete message. #1325
• Added heartbeat parameter for websocket to automatically send ping message. #1024 #777
• Remove web.Application dependency from web.UrlDispatcher #1510
• Accepting back-pressure from slow websocket clients #1367
• Do not pause transport during set_parser stage #1211
• Lingering close doesn’t terminate before timeout #1559
• setsockopt may raise OSError exception if socket is closed already #1595
• Lots of CancelledError when requests are interrupted #1565
• Allow users to specify what should happen to decoding errors when calling a responses text() method #1542
• Back port std module http.cookies for python3.4.2 #1566
• Maintain url’s fragment in client response #1314
• Allow concurrently close WebSocket connection #754
• Gzipped responses with empty body raises ContentEncodingError #609
• Return 504 if request handle raises TimeoutError.
• Refactor how we use keep-alive and close lingering timeouts.
• Close response connection if we can not consume whole http message during client response release
• Abort closed ssl client transports, broken servers can keep socket open un-limit time #1568
• Log warning instead of RuntimeError is websocket connection is closed.
• Deprecated: aiohttp.protocol.HttpPrefixParser will be removed in 1.4 #1590
• Deprecated: Servers response’s .started, .start() and .can_start() method will be removed in 1.4 #1591
• Deprecated: Adding sub app via app.router.add_subapp() is deprecated use app.add_subapp() instead, will be removed in 1.4 #1592
• Deprecated: aiohttp.get(), aiohttp.options(), aiohttp.head(), aiohttp.post(), aiohttp.put(), aiohttp.patch(), aiohttp.delete(), and aiohttp.ws_connect() will be removed in 1.4 #1593
• Deprecated: Application.finish() and Application.register_on_finish() will be removed in 1.4 #1602