From 14738ff83d852c95a0cf33e5c90a85860a9c5620 Mon Sep 17 00:00:00 2001
From: Berker Peksag <berker.peksag@gmail.com>
Date: Fri, 24 May 2019 20:24:42 +0300
Subject: [PATCH] bpo-8138: Initialize wsgiref's SimpleServer as
 single-threaded (GH-12977)

---
 Lib/wsgiref/simple_server.py                                   | 3 ++-
 .../next/Library/2019-04-27-02-54-23.bpo-8138.osBRGI.rst       | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2019-04-27-02-54-23.bpo-8138.osBRGI.rst

diff --git a/Lib/wsgiref/simple_server.py b/Lib/wsgiref/simple_server.py
index f71563a5ae0..93d01a863ad 100644
--- a/Lib/wsgiref/simple_server.py
+++ b/Lib/wsgiref/simple_server.py
@@ -127,7 +127,8 @@ class WSGIRequestHandler(BaseHTTPRequestHandler):
             return
 
         handler = ServerHandler(
-            self.rfile, self.wfile, self.get_stderr(), self.get_environ()
+            self.rfile, self.wfile, self.get_stderr(), self.get_environ(),
+            multithread=False,
         )
         handler.request_handler = self      # backpointer for logging
         handler.run(self.server.get_app())
diff --git a/Misc/NEWS.d/next/Library/2019-04-27-02-54-23.bpo-8138.osBRGI.rst b/Misc/NEWS.d/next/Library/2019-04-27-02-54-23.bpo-8138.osBRGI.rst
new file mode 100644
index 00000000000..e94d0a68d46
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-04-27-02-54-23.bpo-8138.osBRGI.rst
@@ -0,0 +1,2 @@
+Don't mark ``wsgiref.simple_server.SimpleServer`` as multi-threaded since
+``wsgiref.simple_server.WSGIServer`` is single-threaded.