Issue #3839: wsgiref should not override a Content-Length header set by

the application.  Initial patch by Clovis Fabricio.

2 files changed, 14 insertions, 5 deletions

diff --git a/Lib/test/test_wsgiref.py b/Lib/test/test_wsgiref.py
index b8cf635..a08f66b 100644
--- a/Lib/test/test_wsgiref.py
+++ b/Lib/test/test_wsgiref.py
@@ -520,6 +520,11 @@ class HandlerTests(TestCase):
             s('200 OK',[])
             return ['\u0442\u0435\u0441\u0442'.encode("utf-8")]
 
+        def trivial_app4(e,s):
+            # Simulate a response to a HEAD request
+            s('200 OK',[('Content-Length', '12345')])
+            return []
+
         h = TestHandler()
         h.run(trivial_app1)
         self.assertEqual(h.stdout.getvalue(),
@@ -543,10 +548,12 @@ class HandlerTests(TestCase):
             b'\r\n'
             b'\xd1\x82\xd0\xb5\xd1\x81\xd1\x82')
 
-
-
-
-
+        h = TestHandler()
+        h.run(trivial_app4)
+        self.assertEqual(h.stdout.getvalue(),
+            b'Status: 200 OK\r\n'
+            b'Content-Length: 12345\r\n'
+            b'\r\n')
 
     def testBasicErrorOutput(self):
 
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 @@ class BaseHandler:
     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?