[1.9.x] Fixed #26024 -- Fixed regression in ConditionalGetMiddleware ETag support.

Backport of 186b6c61bfe85afa4d6bf213d04a28dd2853fed2 from master

1 files changed, 7 insertions, 0 deletions

diff --git a/django/utils/http.py b/django/utils/http.py
index 8bbafaedec..70bcbd90ac 100644
--- a/django/utils/http.py
+++ b/django/utils/http.py
@@ -253,6 +253,13 @@ def quote_etag(etag):
     return '"%s"' % etag.replace('\\', '\\\\').replace('"', '\\"')
 
 
+def unquote_etag(etag):
+    """
+    Unquote an ETag string; i.e. revert quote_etag().
+    """
+    return etag.strip('"').replace('\\"', '"').replace('\\\\', '\\') if etag else etag
+
+
 def is_same_domain(host, pattern):
     """
     Return ``True`` if the host is either an exact match or a match