Fixed #25619 -- Made runserver serve with HTTP 1.1 protocol

Thanks Tim Graham for the review.

django/core/servers/basehttp.py

@@ -78,6 +78,8 @@ class ThreadedWSGIServer(socketserver.ThreadingMixIn, WSGIServer):
 
 
 class ServerHandler(simple_server.ServerHandler):
+    http_version = '1.1'
+
     def handle_error(self):
         # Ignore broken pipe errors, otherwise pass on
         if not is_broken_pipe_error():
@@ -85,6 +87,8 @@ class ServerHandler(simple_server.ServerHandler):
 
 
 class WSGIRequestHandler(simple_server.WSGIRequestHandler):
+    protocol_version = 'HTTP/1.1'
+
     def address_string(self):
         # Short-circuit parent method to not call socket.getfqdn
         return self.client_address[0]
@@ -131,8 +135,14 @@ class WSGIRequestHandler(simple_server.WSGIRequestHandler):
         return super().get_environ()
 
     def handle(self):
-        """Copy of WSGIRequestHandler, but with different ServerHandler"""
+        """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:
             self.requestline = ''

docs/releases/2.0.txt

@@ -173,7 +173,7 @@ Models
 Requests and Responses
 ~~~~~~~~~~~~~~~~~~~~~~
 
-* ...
+* The :djadmin:`runserver` Web server supports HTTP 1.1.
 
 Serialization
 ~~~~~~~~~~~~~

tests/servers/tests.py

@@ -4,11 +4,13 @@ Tests for django.core.servers.
 import errno
 import os
 import socket
+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
 
@@ -50,6 +52,20 @@ class LiveServerAddress(LiveServerBase):
 
 
 class LiveServerViews(LiveServerBase):
+    def test_protocol(self):
+        """Launched server serves with HTTP 1.1."""
+        with captured_stdout() as debug_output:
+            conn = HTTPConnection(LiveServerViews.server_thread.host, LiveServerViews.server_thread.port)
+            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()
+            finally:
+                conn.close()
+        self.assertEqual(debug_output.getvalue().count("reply: 'HTTP/1.1 200 OK"), 2)
+
     def test_404(self):
         with self.assertRaises(HTTPError) as err:
             self.urlopen('/')