Fixed #28440 -- Fixed WSGIServer hang on responses without a Content-Length.

Disabled keep-alive to fix the regression in
e6065c7b83.

django/core/servers/basehttp.py

@@ -135,13 +135,6 @@ class WSGIRequestHandler(simple_server.WSGIRequestHandler):
         return super().get_environ()
 
     def handle(self):
-        """Handle multiple requests if necessary."""
-        self.close_connection = 1
-        self.handle_one_request()
-        while not self.close_connection:
-            self.handle_one_request()
-
-    def handle_one_request(self):
         """Copy of WSGIRequestHandler.handle() but with different ServerHandler"""
         self.raw_requestline = self.rfile.readline(65537)
         if len(self.raw_requestline) > 65536:

tests/servers/tests.py

@@ -4,16 +4,21 @@ Tests for django.core.servers.
 import errno
 import os
 import socket
+import sys
 from http.client import HTTPConnection
 from urllib.error import HTTPError
 from urllib.parse import urlencode
 from urllib.request import urlopen
 
 from django.test import LiveServerTestCase, override_settings
-from django.test.utils import captured_stdout
 
 from .models import Person
 
+try:
+    from http.client import RemoteDisconnected
+except ImportError:  # Python 3.4
+    from http.client import BadStatusLine as RemoteDisconnected
+
 TEST_ROOT = os.path.dirname(__file__)
 TEST_SETTINGS = {
     'MEDIA_URL': '/media/',
@@ -54,17 +59,31 @@ class LiveServerAddress(LiveServerBase):
 class LiveServerViews(LiveServerBase):
     def test_protocol(self):
         """Launched server serves with HTTP 1.1."""
-        with captured_stdout() as debug_output:
+        with self.urlopen('/example_view/') as f:
-            conn = HTTPConnection(LiveServerViews.server_thread.host, LiveServerViews.server_thread.port)
+            self.assertEqual(f.version, 11)
+
+    @override_settings(MIDDLEWARE=[])
+    def test_closes_connection_without_content_length(self):
+        """
+        The server doesn't support keep-alive because Python's http.server
+        module that it uses hangs if a Content-Length header isn't set (for
+        example, if CommonMiddleware isn't enabled or if the response is a
+        StreamingHttpResponse) (#28440 / https://bugs.python.org/issue31076).
+        """
+        conn = HTTPConnection(LiveServerViews.server_thread.host, LiveServerViews.server_thread.port, timeout=1)
+        try:
+            conn.request('GET', '/example_view/', headers={'Connection': 'keep-alive'})
+            response = conn.getresponse().read()
+            conn.request('GET', '/example_view/', headers={'Connection': 'close'})
+            with self.assertRaises(RemoteDisconnected, msg='Server did not close the connection'):
                 try:
-                conn.set_debuglevel(1)
-                conn.request('GET', '/example_view/', headers={"Connection": "keep-alive"})
-                conn.getresponse().read()
-                conn.request('GET', '/example_view/', headers={"Connection": "close"})
                     conn.getresponse()
+                except ConnectionAbortedError:
+                    if sys.platform == 'win32':
+                        self.skipTest('Ignore nondeterministic failure on Windows.')
         finally:
             conn.close()
-        self.assertEqual(debug_output.getvalue().count("reply: 'HTTP/1.1 200 OK"), 2)
+        self.assertEqual(response, b'example view')
 
     def test_404(self):
         with self.assertRaises(HTTPError) as err: