aiohttp 3.2.0

Async http client/server framework (asyncio)

Async http client/server framework

Key Features

• Supports both client and server side of HTTP protocol.

• Supports both client and server Web-Sockets out-of-the-box without the Callback Hell.

• 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):
    async with session.get(url) as response:
        return await response.text()

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

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

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

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

    return ws


app = web.Application()
app.add_routes([web.get('/', handle),
                web.get('/echo', wshandle),
                web.get('/{name}', handle)])

web.run_app(app)

Documentation

https://aiohttp.readthedocs.io/

Demos

https://github.com/aio-libs/aiohttp-demos

External links

• Third party libraries

• Built with aiohttp

• Powered by aiohttp

Feel free to make a Pull Request for adding your link to these pages!

Communication channels

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

Feel free to post your questions and ideas here.

gitter chat https://gitter.im/aio-libs/Lobby

We support Stack Overflow. Please add aiohttp tag to your question there.

Requirements

• Python >= 3.5.3

• async-timeout

• attrs

• 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.

Keepsafe

The aiohttp community would like to thank Keepsafe (https://www.getkeepsafe.com) for it’s support in the early days of the project.

Source code

The latest developer version is available in a github repository: https://github.com/aio-libs/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

Changelog

3.2.0 (2018-05-06)

Features

• Raise TooManyRedirects exception when client gets redirected too many times instead of returning last response. (#2631)

• Extract route definitions into separate web_routedef.py file (#2876)

• Raise an exception on request body reading after sending response. (#2895)

• ClientResponse and RequestInfo now have real_url property, which is request url without fragment part being stripped (#2925)

• Speed up connector limiting (#2937)

• Added and links property for ClientResponse object (#2948)

• Add request.config_dict for exposing nested applications data. (#2949)

• Speed up HTTP headers serialization, server micro-benchmark runs 5% faster now. (#2957)

• Apply assertions in debug mode only (#2966)

Bugfixes

• expose property app for TestClient (#2891)

• Call on_chunk_sent when write_eof takes as a param the last chunk (#2909)

• A closing bracket was added to __repr__ of resources (#2935)

• Fix compression of FileResponse (#2942)

• Fixes some bugs in the limit connection feature (#2964)

Improved Documentation

• Drop async_timeout usage from documentation for client API in favor of timeout parameter. (#2865)

• Improve Gunicorn logging documentation (#2921)

• Replace multipart writer .serialize() method with .write() in documentation. (#2965)

Deprecations and Removals

• Deprecate Application.make_handler() (#2938)

Misc

• #2958