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aiohttp.ClientSession does not set cookie with 'expires' key


By : T. Brown
Date : September 16 2020, 10:00 AM


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Aiohttp ClientSession outside coroutine


By : Jonasz
Date : March 29 2020, 07:55 AM
it helps some times
Why is it a problem starting a ClientSession outside of a coroutine?

How to set up logging for aiohttp.client when making request with aiohttp.ClientSession()?


By : Pal Buff
Date : March 29 2020, 07:55 AM
will be helpful for those in need As you can see in aiohttp's code, the aiohttp.client logger is not used to log requests, but can only log a warning if the cookies in the response are invalid https://github.com/aio-libs/aiohttp/search?utf8=%E2%9C%93&q=client_logger&type=
To log every requests you are doing, you will need to create a custom ClientSession that does what you want. Something like:
code :
class LoggingClientSession(aiohttp.ClientSession):
    def request(self, method, url, **kwargs):
        logger.debug('Starting request <%s %r>', method, url)
        return super().request(method, url, **kwargs)
class LoggingClientSession(aiohttp.ClientSession):
    async def _request(self, method, url, **kwargs):
        logger.debug('Starting request <%s %r>', method, url)
        return await super()._request(method, url, **kwargs)

How to use an aiohttp ClientSession with Sanic?


By : Maroš Maño Gonda
Date : March 29 2020, 07:55 AM
it fixes the issue In order to use a single aiohttp.ClientSession we need to instantiate the session only once and use that specific instance in the rest of the application.
To achieve this we can use a before_server_start listener which will allow us to create the instance before the app serves the first byte.
code :
from sanic import Sanic 
from sanic.response import json

import aiohttp

app = Sanic(__name__)

@app.listener('before_server_start')
def init(app, loop):
    app.aiohttp_session = aiohttp.ClientSession(loop=loop)

@app.listener('after_server_stop')
def finish(app, loop):
    loop.run_until_complete(app.aiohttp_session.close())
    loop.close()

@app.route("/")
async def test(request):
    """
    Download and serve example JSON
    """
    url = "https://api.github.com/repos/channelcat/sanic"

    async with app.aiohttp_session.get(url) as response:
        return await response.json()


app.run(host="0.0.0.0", port=8000, workers=2)

Unable to get webpage using aiohttp ClientSession


By : Nikita Sharma
Date : March 29 2020, 07:55 AM
it fixes the issue I would like to use asyncio to get the webpage. ,
What's wrong with my code?
code :
UnicodeDecodeError: 'gb18030' codec can't decode byte 0xb7 in position 47676: illegal multibyte sequence

How to close aiohttp ClientSession


By : Ade
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Ahh, i think i got it now.
The warnings i got Unclosed client session and Unclosed connector was aiohttp telling me "hey, you forgot to close the session". And this is exactly what happened with this small example. Both calls to get_url would actually get a response from the server, and then the app would end. So the session would then be left in an unclosed state when the app ended, which is why the abover warnings were shown.
code :
import asyncio  # only here for debugging purposes
import aiohttp

USER_AGENT = 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:61.0) Gecko/20100101 Firefox/61.1'


def default_headers():
    header = {
        'User-Agent': USER_AGENT
    }
    return header


class WebSession(object):
    session = None

    @classmethod
    def create(cls):
        cls.session = aiohttp.ClientSession()
        return cls.session

    @classmethod
    def close(cls):
        if cls.session is not None:
            # apparently this is supposed to return a future?
            return cls.session.close()


async def request(method, url, **kwargs):

    if kwargs.get('headers', None) is None:
        kwargs['headers'] = default_headers()

    if WebSession.session is None:
        session = WebSession.create()
    else:
        session = WebSession.session

    return await session.request(method=method, url=url, **kwargs)


async def get(url, **kwargs):
    return await request('GET', url=url, **kwargs)


async def post(url, **kwargs):
    return await request('POST', url=url, **kwargs)


async def get_url():
    res = await get('https://httpbin.org/get')
    print(f'Headers: {res.headers}')


async def close():
    # run this before the app ends
    await WebSession.close()

# so imagine that this is our app.
m_loop = asyncio.get_event_loop()
# its running now and doing stuff..

# then it makes a request to a url.
m_loop.run_until_complete(get_url())
# then some time passes, and then it makes another request to a url.
m_loop.run_until_complete(get_url())
# now the app gets stopped, whether by keyboard interrupt or some other means of stopping it
# then close the session
m_loop.run_until_complete(close())
# and then end the app..
m_loop.close()
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