To help you get started, we've collected the most common ways that aiohttp is being used within popular public projects.

instana / python-sensor / tests / frameworks / test_aiohttp.py View on Github

async def test():
            with async_tracer.start_active_span('test'):
                async with aiohttp.ClientSession() as session:
                    return await self.fetch(session, testenv["wsgi_server"] + "/500")

View more ways to use aiohttp

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 and avoids Callback Hell.
• Provides Web-server with middlewares and plugable 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:  ...

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

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 discourse group:

gitter chat

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

Requirements

• Python >= 3.6
• async-timeout
• attrs
• charset-normalizer
• multidict
• yarl
• frozenlist

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 () for its support in the early days of the project.

Source code

The latest developer version is available in a GitHub repository:

Benchmarks

If you are interested in efficiency, the AsyncIO community maintains a list of benchmarks on the official wiki: