Allow image files to be cached.

lms/djangoapps/branding/__init__.py

@@ -4,6 +4,7 @@ from django.conf import settings
 
 from opaque_keys.edx.locations import SlashSeparatedCourseKey
 from microsite_configuration import microsite
+from staticfiles.storage import staticfiles_storage
 
 
 def get_visible_courses():
@@ -65,14 +66,8 @@ def get_logo_url():
     university = microsite.get_value('university')
 
     if university is None and settings.FEATURES.get('IS_EDX_DOMAIN', False):
-        return '{static_url}images/edx-theme/edx-logo-77x36.png'.format(
-            static_url=settings.STATIC_URL
-        )
+        return staticfiles_storage.url('images/edx-theme/edx-logo-77x36.png')
     elif university:
-        return '{static_url}images/{uni}-on-edx-logo.png'.format(
-            static_url=settings.STATIC_URL, uni=university
-        )
+        return staticfiles_storage.url('images/{uni}-on-edx-logo.png'.format(uni=university))
     else:
-        return '{static_url}images/default-theme/logo.png'.format(
-            static_url=settings.STATIC_URL
-        )
+        return staticfiles_storage.url('images/default-theme/logo.png')