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Asynchronous HTTP client/server framework for asyncio and Python

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Async http client/server framework

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GitHub Actions status for master branch codecov.io status for master branch Codspeed.io status for aiohttp Latest PyPI package version Downloads count 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

External links

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

Communication channels

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

Matrix: #aio-libs:matrix.org

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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Asynchronous HTTP client/server framework for asyncio and Python

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