aiohttp 1.2.0

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, 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

1.2.0 (2016-12-17)

• Extract BaseRequest from web.Request, introduce web.Server (former RequestHandlerFactory), introduce new low-level web server which is not coupled with web.Application and routing #1362

• Make TestServer.make_url compatible with yarl.URL #1389

• Implement range requests for static files #1382

• Support task attribute for StreamResponse #1410

• Drop TestClient.app property, use TestClient.server.app instead (BACKWARD INCOMPATIBLE)

• Drop TestClient.handler property, use TestClient.server.handler instead (BACKWARD INCOMPATIBLE)

• TestClient.server property returns a test server instance, was asyncio.AbstractServer (BACKWARD INCOMPATIBLE)

• Follow gunicorn’s signal semantics in Gunicorn[UVLoop]WebWorker #1201

• Call worker_int and worker_abort callbacks in Gunicorn[UVLoop]WebWorker #1202

• Has functional tests for client proxy #1218

• Fix bugs with client proxy target path and proxy host with port #1413

• Fix bugs related to the use of unicode hostnames #1444

• Preserve cookie quoting/escaping #1453

• FileSender will send gzipped response if gzip version available #1426

• Don’t override Content-Length header in web.Response if no body was set #1400

• Introduce router.post_init() for solving #1373

• Fix raise error in case of multiple calls of TimeServive.stop()

• Allow to raise web exceptions on router resolving stage #1460

• Add a warning for session creation outside of coroutine #1468

• Avoid a race when application might start accepting incoming requests but startup signals are not processed yet e98e8c6

• Raise a RuntimeError when trying to change the status of the HTTP response after the headers have been sent #1480

• Fix bug with https proxy acquired cleanup #1340

• Use UTF-8 as the default encoding for multipart text parts #1484