aiohttp 3.3.0

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

3.3.0 (2018-06-01)

Features

• Raise ConnectionResetError instead of CancelledError on trying to write to a closed stream. (#2499)

• Implement ClientTimeout class and support socket read timeout. (#2768)

• Enable logging when aiohttp.web is used as a program (#2956)

• Add canonical property to resources (#2968)

• Forbid reading response BODY after release (#2983)

• Implement base protocol class to avoid a dependency from internal asyncio.streams.FlowControlMixin (#2986)

• Cythonize @helpers.reify, 5% boost on macro benchmark (#2995)

• Optimize HTTP parser (#3015)

• Implement runner.addresses property. (#3036)

• Use bytearray instead of a list of bytes in websocket reader. It improves websocket message reading a little. (#3039)

• Remove heartbeat on closing connection on keepalive timeout. The used hack violates HTTP protocol. (#3041)

• Limit websocket message size on reading to 4 MB by default. (#3045)

Bugfixes

• Don’t reuse a connection with the same URL but different proxy/TLS settings (#2981)

• When parsing the Forwarded header, the optional port number is now preserved. (#3009)

Improved Documentation

• Make Change Log more visible in docs (#3029)

• Make style and grammar improvements on the FAQ page. (#3030)

• Document that signal handlers should be async functions since aiohttp 3.0 (#3032)

Deprecations and Removals

• Deprecate custom application’s router. (#3021)

Misc

• #3008, #3011