Merge ~pappacena/twisted:py3-cgiscript into ~pappacena/twisted:conch-ssh-multiplex-session-env

[Thiago F. Pappacena]

Backporting fix for bug mixing str and bytes on CGIScript resource

Unmerged commits

a8b12a6... by Thiago F. Pappacena on 2020-12-15

Fixing problem mixing str and bytes on CGIScript resource

diff --git a/src/twisted/web/twcgi.py b/src/twisted/web/twcgi.py
index 1c92960..9e3f406 100644
--- a/src/twisted/web/twcgi.py
+++ b/src/twisted/web/twcgi.py
@@ -109,7 +109,7 @@ class CGIScript(resource.Resource):
             qargs = []
         else:
             qs = env['QUERY_STRING'] = request.uri[qindex+1:]
-            if '=' in qs:
+            if b"=" in qs:
                 qargs = []
             else:
                 qargs = [urllib.unquote(x) for x in qs.split('+')]