Fixed #18003 -- Preserved tracebacks when re-raising errors.

Thanks jrothenbuhler for draft patch, Konark Modi for updates.

1 files changed, 1 insertions, 1 deletions

diff --git a/django/utils/http.py b/django/utils/http.py
index 0ab5198804..73b6396286 100644
--- a/django/utils/http.py
+++ b/django/utils/http.py
@@ -144,7 +144,7 @@ def parse_http_date(date):
         result = datetime.datetime(year, month, day, hour, min, sec)
         return calendar.timegm(result.utctimetuple())
     except Exception:
-        raise ValueError("%r is not a valid date" % date)
+        six.reraise(ValueError, ValueError("%r is not a valid date" % date), sys.exc_info()[2])
 
 def parse_http_date_safe(date):
     """