pythongh-66425: Remove the unreachable code to set REMOTE_HOST header (pythongh-111441)

Author: c-bata

Lib/wsgiref/simple_server.py

@@ -84,10 +84,6 @@ def get_environ(self):
 
         env['PATH_INFO'] = urllib.parse.unquote(path, 'iso-8859-1')
         env['QUERY_STRING'] = query
-
-        host = self.address_string()
-        if host != self.client_address[0]:
-            env['REMOTE_HOST'] = host
         env['REMOTE_ADDR'] = self.client_address[0]
 
         if self.headers.get('content-type') is None:

Misc/NEWS.d/next/Library/2023-10-29-03-46-27.gh-issue-66425.FWTdDo.rst

@@ -0,0 +1,3 @@
+Remove the code to set the REMOTE_HOST header from wsgiref module,
+as it is unreachable. This header is used for performance reasons,
+which is not necessary in the wsgiref module.