aiohttp

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

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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:

.. code-block:: python

  import aiohttp
  import asyncio

  async def main():

      async with aiohttp.ClientSession() as session:
          async with session.get('https://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:

.. 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()