Issue #3839: wsgiref should not override a Content-Length header set by
the application. Initial patch by Clovis Fabricio.
diff --git a/Lib/wsgiref/handlers.py b/Lib/wsgiref/handlers.py
index 6d6f80f..67064a6 100644
--- a/Lib/wsgiref/handlers.py
+++ b/Lib/wsgiref/handlers.py
@@ -302,7 +302,9 @@
def finish_content(self):
"""Ensure headers and content have both been sent"""
if not self.headers_sent:
- self.headers['Content-Length'] = "0"
+ # Only zero Content-Length if not set by the application (so
+ # that HEAD requests can be satisfied properly, see #3839)
+ self.headers.setdefault('Content-Length', "0")
self.send_headers()
else:
pass # XXX check if content-length was too short?