fix type mismatch in TracebackMiddleware

cgitb.html returns str, but wsgi must return bytes.

1 files changed, 1 insertions, 1 deletions

diff --git a/wsgitools/middlewares.py b/wsgitools/middlewares.py
index 1619e0b..1cb5622 100644
--- a/wsgitools/middlewares.py
+++ b/wsgitools/middlewares.py
@@ -414,4 +414,4 @@ class TracebackMiddleware(object):
                                       ("Content-length", str(len(data)))])
             if environ["REQUEST_METHOD"].upper() == "HEAD":
                 return []
-            return [data]
+            return [str2bytes(data)]