Can't use proxies with asyncio Client

[akoziy98]

Hi all!
It is not possible to adapt the work of your asynchronous part of the library to work with a proxy.

And in general, all asynchronous requests and streams do not support proxies.
The documentation suggests using the export of parameters as an env variable to solve this problem, like:

$ export HTTP_PROXY="http://10.10.1.10:3128"
$ export HTTPS_PROXY="http://10.10.1.10:1080"

But this method didn't work for me.

I propose to add a proxy as a request parameter to the creation of an asynchronous client.

As the example. AsyncClient.create starts with using ping to binance server. This ping doesn't get any kwargs to itself.

Adding more flexibility to the asynchronous part of working with proxies can greatly help with development. Especially in those countries where the binance is blocked by the ISP, and the api keys are tied to a given api address.

[sammchardy]

A new parameter session_params was added to the AsyncClient in a recent release which allows a couple of ways of setting a proxy.

https://docs.aiohttp.org/en/stable/client_advanced.html?highlight=proxy#proxy-support

if you use the above env variables then you can include trust_env=True in session_params when creating the AsyncClient.

Otherwise you can pass the proxy directly in session_params