Async http client/server framework (asyncio)

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Project description

aiohttp logo

GitHub Actions status for master branch codecov.io status for master branch Latest PyPI package version Latest Read The Docs Matrix Room — #aio-libs:matrix.org Matrix Space — #aio-libs-space:matrix.org

Key Features

  • Supports both client and server side of HTTP protocol.

  • Supports both client and server Web-Sockets out-of-the-box and avoids Callback Hell.

  • Provides Web-server with middleware and pluggable routing.

Getting started

Client

To get something from the web:

import aiohttp
import asyncio

async def main():

    async with aiohttp.ClientSession() as session:
        async with session.get('http://python.org') as response:

            print("Status:", response.status)
            print("Content-type:", response.headers['content-type'])

            html = await response.text()
            print("Body:", html[:15], "...")

asyncio.run(main())

This prints:

Status: 200
Content-type: text/html; charset=utf-8
Body: <!doctype html> ...

Coming from requests ? Read why we need so many lines.

Server

An example using a simple server:

# examples/server_simple.py
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)])

if __name__ == '__main__':
    web.run_app(app)

Documentation

https://aiohttp.readthedocs.io/

Demos

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

Communication channels

aio-libs Discussions: https://github.com/aio-libs/aiohttp/discussions

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

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

Requirements

Optionally you may install the aiodns library (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 its 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 efficiency, the AsyncIO community maintains a list of benchmarks on the official wiki: https://github.com/python/asyncio/wiki/Benchmarks

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4.0.0a1 pre-release yanked

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4.0.0a0 pre-release yanked

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This version includes overly restrictive multidict upper boundary disallowing multidict v6+. The previous patch version didn't have that and this is now causing dependency resolution problems for the users who have an "incompatible" version pinned. This is not really necessary anymore and will be addressed in the next release v3.8.3 https://github.com/aio-libs/aiohttp/pull/6950

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Uploaded CPython 3.8 manylinux: glibc 2.17+ ppc64le

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Uploaded CPython 3.8 manylinux: glibc 2.17+ ARM64

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Uploaded CPython 3.8 manylinux: glibc 2.17+ i686 manylinux: glibc 2.5+ i686

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Uploaded CPython 3.8 macOS 11.0+ ARM64

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Uploaded CPython 3.8 macOS 10.9+ x86-64

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Uploaded CPython 3.8 macOS 10.9+ universal2 (ARM64, x86-64)

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