1 files changed, 17 insertions, 1 deletions
diff --git a/urllib3/util/retry.py b/urllib3/util/retry.py
index f8f21810..edbfc873 100644
--- a/urllib3/util/retry.py
+++ b/urllib3/util/retry.py
@@ -13,7 +13,6 @@ from ..exceptions import (
 )
 from ..packages import six
 
-
 log = logging.getLogger(__name__)
 
 # Data structure for representing the metadata of requests that result in a retry.
@@ -21,6 +20,9 @@ RequestHistory = namedtuple('RequestHistory', ["method", "url", "error",
                                                "status", "redirect_location"])
 
 
+_POST_REDIRECT_DOWNGRADE_STATUSES = set([301, 302, 303])
+
+
 class Retry(object):
     """ Retry configuration.
 
@@ -311,6 +313,20 @@ class Retry(object):
                 'read={self.read}, redirect={self.redirect})').format(
                     cls=type(self), self=self)
 
+    def redirect_method(self, method, status):
+        """
+        Assuming we're doing a redirect, should we change HTTP methods?
+        """
+        if method == 'GET':
+            return method
+        if method == 'HEAD':
+            return method
+        if status == 303:
+            return 'GET'
+        if method == 'POST' and status in _POST_REDIRECT_DOWNGRADE_STATUSES:
+            return 'GET'
+        return method
+
 
 # For backwards compatibility (equivalent to pre-v1.9):
 Retry.DEFAULT = Retry(3)