How to propagate cookie policies through posts?

Hi,

I am using Python 3.8 and the latest pip updates of everything mentioned below.

I am trying to consume a very old, but active SOAP resource. I am using Zeep for the SOAP part. The SOAP service is so old that I need to set a special cookie policy to handle the fact that the old SOAP service returns obsolete set-cookie2 headers. I am new to this so there could be better ways but the first few executable lines of my code sample (at the bottom) create a dummy cookie to establish a cookie policy that should pull in the obsolete cookies.

THe dummy cookie is attached to the session and the SOAP "login" method is called. I have stepped through the execution path (most recent on top). Everything above the "transports" lines is in the your domain I think.

		merge_cookies, cookies.py:549
		prepare_request, sessions.py:441
		request, sessions.py:516
		post, sessions.py:578
		post, transports.py:61
		post_xml, transports.py:107
		send, soap.py:122
		__call__, proxy.py:40
		<module>, zeep_test.py:31

I have modified Zeep's code to send the session cookies to your "post" method in the "kwargs".

        response = self.session.post(
            address, data=message, headers=headers,
            timeout=self.operation_timeout, 
			cookies=self.session.cookies
        )

"post" calls "request" calls "prepare_request" calls "merge_cookies". That code is:

        # Merge with session cookies
        merged_cookies = merge_cookies(
            merge_cookies(RequestsCookieJar(), self.cookies), cookies)

In my case the passed in cookie is a "cookielib.CookieJar". The line:

        try:
            cookiejar.update(cookies)

is executed but the "cookielib.CookieJar" policies are NOT copied over. I don't know what to do about that. Is there a better way to set a global cookie policy?

A relevant portion of my code is:

		import requests
		from requests import Session, cookies
		from zeep import Client, Settings
		from zeep.cache import SqliteCache
		from zeep.transports import Transport
		from http.cookiejar import CookieJar, DefaultCookiePolicy

		policy = DefaultCookiePolicy(rfc2965=True)
		cj = CookieJar(policy)
		cj.set_cookie(requests.cookies.create_cookie(name="dummy", value="dummy"))

		my_session = Session()
		my_session.cookies = cj

		my_settings = Settings(strict=False)
		my_cache = SqliteCache()
		my_url = 'https://lists.mycompany.com/lists/wsdl'

		client = Client(
			my_url,
			transport=Transport(
				session=my_session,
				cache=my_cache
			),
			settings=my_settings
		)
		
		response = client.service.login(email="Me",
										password="mememe")

Start by reproducing the CookieJar case described in requests/cookies.py:549 and sessions.py:441, where merge_cookies is called during prepare_request. Trace the request path through sessions.py and compare the resulting cookie behavior with the policy configured on http.cookiejar.CookieJar. Done means the supported behavior or required change is established and covered by an appropriate regression test.