The iterable produced by `Session.resolve_redirects` does not include the very first response

If you are manually walking over redirects, you probably want to structure your code like this:

redirect_sequence = session.send_with_manual_redirect_walking(request, ...)
for resp in redirect_sequence:
    # do something with 'resp'

The existing API does not let you do that. You must write either

first_response = session.send(request, ..., allow_redirects=False)
# do something with 'first_response'
for resp in session.resolve_redirects(first_response, request, ...)
    # do something with 'resp'

which involves writing the same "do something with" code in two places, or

resp = session.send(request, ..., allow_redirects=False)
redir_iter = session.resolve_redirects(resp, request, ...)
while True:
    # do something with 'resp'
    if not resp.is_redirect: break
    resp = next(redir_iter)

which is un-Pythonic loop structure.

Since Session.resolve_redirects must remain as is for compatibility's sake, the only way to fix this is to add either a new mode to send (allow_redirects=MANUAL?) or a new Session method (perhaps in fact called send_with_manual_redirect_walking) which returns an iterable that does include the very first response. I do not particularly care which, or what the new method is called in the second case.

Start by reading Session.send and Session.resolve_redirects, focusing on how redirect responses are exposed and why resolve_redirects must remain compatible. Choose and specify the new manual redirect-walking API, then verify that its iterable includes the initial response while preserving existing behavior.