aiohttp 0.19.0

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.

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.

Documentation

http://aiohttp.readthedocs.org/

Discussion list

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

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

Getting started

Client

To retrieve something from the web:

import aiohttp
import asyncio

async def get_body(client, url):
    async with client.get(url) as response:
        return await response.read()

if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    client = aiohttp.ClientSession(loop=loop)
    raw_html = loop.run_until_complete(get_body(client, 'http://python.org'))
    print(raw_html)
    client.close()

If you want to use timeouts for aiohttp client please use standard asyncio approach:

yield from asyncio.wait_for(client.get(url), 10)

Server

This is simple usage example:

import asyncio
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


async def init(loop):
    app = web.Application(loop=loop)
    app.router.add_route('GET', '/echo', wshandler)
    app.router.add_route('GET', '/{name}', handle)

    srv = await loop.create_server(app.make_handler(),
                                        '127.0.0.1', 8080)
    print("Server started at http://127.0.0.1:8080")
    return srv

loop = asyncio.get_event_loop()
loop.run_until_complete(init(loop))
loop.run_forever()

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()

CHANGES

0.19.0 (11-25-2015)

• Memory leak in ParserBuffer #579
• Suppport gunicorn’s max_requests settings in gunicorn worker
• Fix wsgi environment building #573
• Improve access logging #572
• Drop unused host and port from low-level server #586
• Add Python 3.5 async for implementation to server websocket #543
• Add Python 3.5 async for implementation to client websocket
• Add Python 3.5 async with implementation to client websocket
• Add charset parameter to web.Response constructor #593
• Forbid passing both Content-Type header and content_type or charset params into web.Response constructor
• Forbid duplicating of web.Application and web.Request #602
• Add an option to pass Origin header in ws_connect #607
• Add json_response function #592
• Make concurrent connections respect limits #581
• Collect history of responses if redirects occur #614
• Enable passing pre-compressed data in requests #621
• Expose named routes via UrlDispatcher.named_routes() #622
• Allow disabling sendfile by environment variable AIOHTTP_NOSENDFILE #629
• Use ensure_future if available
• Always quote params for Content-Disposition #641
• Support async for in multipart reader #640
• Add Timeout context manager #611