Revert mimetypes change, test with content-type: text/html

Author: ambv

Lib/mimetypes.py

@@ -367,7 +367,7 @@ def init(files=None):
     if files is None or _db is None:
         db = MimeTypes()
         # Quick return if not supported
-        # db.read_windows_registry()
+        db.read_windows_registry()
 
         if files is None:
             files = knownfiles

Lib/test/test_httpservers.py

@@ -593,9 +593,12 @@ def test_html_escape_filename(self):
 #!%s
 import os
 
-print("Content-type: text/plain")
+print("X-ambv: was here")
+print("Content-type: text/html")
 print()
+print("<pre>")
 print(repr(os.environ))
+print("</pre>")
 """