diff --git a/requests/sessions.py b/requests/sessions.py
index 8aff5913..c0a0e851 100644
--- a/requests/sessions.py
+++ b/requests/sessions.py
@@ -112,10 +112,16 @@ class SessionRedirectMixin(object):
                 method = 'GET'
 
             # Do what the browsers do, despite standards...
-            if (resp.status_code in (codes.moved, codes.found) and
+            # First, turn 302s into GETs.
+            if (resp.status_code == codes.found and
                     method not in ('GET', 'HEAD')):
                 method = 'GET'
 
+            # Second, if a POST is responded to with a 301, turn it into a GET.
+            # This bizarre behaviour is explained in Issue 1704.
+            if (resp.status_code == codes.moved) and (method == 'POST'):
+                method = 'GET'
+
             prepared_request.method = method
 
             # https://github.com/kennethreitz/requests/issues/1084