diff --git a/django/http/__init__.py b/django/http/__init__.py
index 74113b080a..2dfe12ee4b 100644
--- a/django/http/__init__.py
+++ b/django/http/__init__.py
@@ -642,8 +642,8 @@ class HttpResponseRedirectBase(HttpResponse):
     def __init__(self, redirect_to):
         super(HttpResponseRedirectBase, self).__init__()
         parsed = urlparse(redirect_to)
-        if parsed.scheme and parsed.scheme not in self.allowed_schemes:
-            raise SuspiciousOperation("Unsafe redirect to URL with scheme '%s'" % parsed.scheme)
+        if parsed[0] and parsed[0] not in self.allowed_schemes:
+            raise SuspiciousOperation("Unsafe redirect to URL with scheme '%s'" % parsed[0])
         self['Location'] = iri_to_uri(redirect_to)
 
 class HttpResponseRedirect(HttpResponseRedirectBase):
diff --git a/django/http/utils.py b/django/http/utils.py
index 01808648ba..3fdebf0474 100644
--- a/django/http/utils.py
+++ b/django/http/utils.py
@@ -76,7 +76,7 @@ def fix_IE_for_vary(request, response):
 
     # The first part of the Content-Type field will be the MIME type,
     # everything after ';', such as character-set, can be ignored.
-    mime_type = response.get('Content-Type', '').partition(';')[0]
+    mime_type = response.get('Content-Type', '').split(';', 1)[0]
     if mime_type not in safe_mime_types:
         try:
             del response['Vary']