Key Features

Asynchronous HTTP client/server framework for asyncio and Python
Under Other
By aio-libs

python hacktoberfest http async asyncio http-client http-server aiohttp

==================================
Async http client/server framework
==================================

.. image:: https://raw.githubusercontent.com/aio-libs/aiohttp/master/docs/aiohttp-plain.svg
:height: 64px
:width: 64px
:alt: aiohttp logo

.. image:: https://github.com/aio-libs/aiohttp/workflows/CI/badge.svg
:target: https://github.com/aio-libs/aiohttp/actions?query=workflow%3ACI
:alt: GitHub Actions status for master branch

.. image:: https://codecov.io/gh/aio-libs/aiohttp/branch/master/graph/badge.svg
:target: https://codecov.io/gh/aio-libs/aiohttp
:alt: codecov.io status for master branch

.. image:: https://badge.fury.io/py/aiohttp.svg
:target: https://pypi.org/project/aiohttp
:alt: Latest PyPI package version

.. image:: https://img.shields.io/pypi/dm/aiohttp
:target: https://pypistats.org/packages/aiohttp
:alt: Downloads count

.. image:: https://readthedocs.org/projects/aiohttp/badge/?version=latest
:target: https://docs.aiohttp.org/
:alt: Latest Read The Docs

.. image:: https://img.shields.io/discourse/status?server=https%3A%2F%2Faio-libs.discourse.group
:target: https://aio-libs.discourse.group
:alt: Discourse status

.. image:: https://badges.gitter.im/Join%20Chat.svg
:target: https://gitter.im/aio-libs/Lobby
:alt: Chat on Gitter

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:

.. code-block:: python

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], "...")

loop = asyncio.get_event_loop()
loop.run_until_complete(main())

This prints:

.. code-block::

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

Coming from requests <https://requests.readthedocs.io/> ? Read why we need so many lines <https://aiohttp.readthedocs.io/en/latest/http_request_lifecycle.html>.

Server

An example using a simple server:

.. code-block:: python

# 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

Third party libraries <http://aiohttp.readthedocs.io/en/latest/third_party.html>_

Built with aiohttp <http://aiohttp.readthedocs.io/en/latest/built_with.html>_

Powered by aiohttp <http://aiohttp.readthedocs.io/en/latest/powered_by.html>_

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

Communication channels

aio-libs discourse group: https://aio-libs.discourse.group

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

We support Stack Overflow <https://stackoverflow.com/questions/tagged/aiohttp>_.
Please add aiohttp tag to your question there.

Requirements

Python >= 3.7

async-timeout_

chardet_

multidict_

yarl_

Optionally you may install the cChardet_ and aiodns_ libraries (highly
recommended for sake of speed).

.. _chardet: https://pypi.python.org/pypi/chardet
.. _aiodns: https://pypi.python.org/pypi/aiodns
.. _multidict: https://pypi.python.org/pypi/multidict
.. _yarl: https://pypi.python.org/pypi/yarl
.. _async-timeout: https://pypi.python.org/pypi/async_timeout
.. _cChardet: https://pypi.python.org/pypi/cchardet

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