• Python >= 3.3
• asyncio https://pypi.python.org/pypi/asyncio/0.4.1

aiohttp is offered under the BSD license.

http://aiohttp.readthedocs.org/

To retrieve something from the web:

import aiohttp

def get_body(url):
    response = yield from aiohttp.request('GET', url)
    return (yield from response.read())

You can use the get command like this anywhere in your asyncio powered program:

response = yield from aiohttp.request('GET', 'http://python.org')
body = yield from response.read()
print(body)

The signature of request is the following:

request(method, url, *,
        params=None,
        data=None,
        headers=None,
        cookies=None,
        auth=None,
        allow_redirects=True,
        max_redirects=10,
        encoding='utf-8',
        version=aiohttp.HttpVersion11,
        compress=None,
        chunked=None,
        expect100=False,
        connector=None,
        read_until_eof=True,
        request_class=None,
        response_class=None,
        loop=None
)

It constructs and sends a request. It returns response object. Parameters are explained as follow:

• method: HTTP method
• url: Request url
• params: (optional) Dictionary or bytes to be sent in the query string of the new request
• data: (optional) Dictionary, bytes, StreamReader or file-like object to send in the body of the request
• headers: (optional) Dictionary of HTTP Headers to send with the request
• cookies: (optional) Dict object to send with the request
• auth: (optional) BasicAuth tuple to enable Basic HTTP Basic Auth
• allow_redirects: (optional) Boolean. Set to True if POST/PUT/DELETE redirect following is allowed.
• version: Request http version.
• compress: Boolean. Set to True if request has to be compressed with deflate encoding.
• chunked: Boolean or Integer. Set to chunk size for chunked transfer encoding.
• expect100: Boolean. Expect 100-continue response from server.
• connector: aiohttp.connector.BaseConnector instance to support connection pooling and session cookies.
• read_until_eof: Read response until eof if response does not have Content-Length header.
• request_class: Custom Request class implementation.
• response_class: Custom Response class implementation.
• loop: Optional event loop.

If you want to use timeouts for aiohttp client side please use standard asyncio approach:

yield from asyncio.wait_for(request('GET', url), 10)

Since version 0.19.0 gunicorn has native support for aiohttp.

Paster configuration example:

[server:main]
use = egg:gunicorn#main
host = 0.0.0.0
port = 8080
worker_class = aiohttp.worker.AsyncGunicornWorker