fix

Author: jablan

openapi-generator/templates/python/rest.mustache

@@ -41,7 +41,7 @@ class RESTResponse(io.IOBase):
     def getencoding(self):
         """Returns charset encoding returned by the server."""
         encoding = 'utf-8'
-        content_type = self.headers.get('Content-Type')
+        content_type = self.getheader('Content-Type')
         if content_type:
             m = re.search(r'charset=(\S+)', content_type)
             if m: encoding = m.group(1)