better error message in paste.auth.cookie

1 files changed, 5 insertions, 0 deletions

diff --git a/paste/auth/cookie.py b/paste/auth/cookie.py
index 8dede14..b4ed0b4 100644
--- a/paste/auth/cookie.py
+++ b/paste/auth/cookie.py
@@ -275,6 +275,11 @@ class AuthCookieHandler:
             for k in scanlist:
                 v = environ.get(k,None)
                 if v is not None:
+                    if type(v) is not str:
+                        raise ValueError(
+                            "The value of the environmental variable %r "
+                            "is not a str (only str is allowed; got %r)"
+                            % (k, v))
                     content.append("%s=%s" % (encode(k),encode(v)))
             if content:
                 content = ";".join(content)