You know, there are too much work for the refactoring, I don't know how to make it correctly and not to break an existing api.
But you have two options:

• use environment variables (I think this is a preferred way)
• I made simple changes, which allows you to make what you need make ability to pass requests Session object #15.
  They will not be available in stable branch for now, so you need to do something like this:

# install modified version
pip install git+https://github.com/mercuree/html-telegraph-poster.git@pass_request

then you can create an instance like this (anyway i didn't test it):

# use the docs to configure it [properly ](https://docs.python-requests.org/en/master/user/advanced/#proxies)
proxies = {
  'http': 'http://10.10.1.10:3128',
  'https': 'http://10.10.1.10:1080',
}
r = requests.Session()
r.proxies.update(proxies)

t = TelegraphPoster(use_api=True, request=r)

I tried it, but it doesn't work for me.
Most likely it's my bad hands)
But without "import requests" the code doesn't work,
and when I import "requests", it sends everything
from any specified proxy (for example: 1.1.1.1:1111),
which means sending through proxies doesn't work.