Tracking Previous Requests

Addresses the issue brought up here:
https://github.com/kennethreitz/requests/issues/1929

requests/sessions.py

@@ -91,10 +91,17 @@ class SessionRedirectMixin(object):
         """Receives a Response. Returns a generator of Responses."""
 
         i = 0
+        hist = [] #keep track of history
 
         while resp.is_redirect:
             prepared_request = req.copy()
 
+            if i > 0:
+                #create deep copy of the history and keep track of redirects
+                hist.append(resp)
+                new_hist = list(hist)
+                resp.history = new_hist
+
             try:
                 resp.content  # Consume socket so it can be released
             except (ChunkedEncodingError, ContentDecodingError, RuntimeError):

test_requests.py

@@ -974,6 +974,13 @@ class RequestsTestCase(unittest.TestCase):
         assert isinstance(s, builtin_str)
         assert s == "Basic dGVzdDp0ZXN0"
 
+    def test_requests_history_is_saved(self):
+        r = requests.get('https://httpbin.org/redirect/5')
+        count = 0
+        for item in r.history:
+            assert len(item.history) == count
+            count = count + 1
+
 
 class TestContentEncodingDetection(unittest.TestCase):
 
@@ -1364,6 +1371,7 @@ class TestRedirects:
             assert session.calls[-1] == send_call
 
 
+
 @pytest.fixture
 def list_of_tuples():
     return [