diff -r 02145b700fe4 -r 1075f5c1b3fa mercurial/hgweb/server.py
--- a/mercurial/hgweb/server.py	Mon Apr 27 16:26:31 2009 +0200
+++ b/mercurial/hgweb/server.py	Mon Apr 27 16:29:26 2009 +0200
@@ -283,6 +283,9 @@
     else:
         handler = _hgwebhandler
 
+    # ugly hack due to python issue5853 (for threaded use)
+    import mimetypes; mimetypes.init()
+
     try:
         if use_ipv6:
             return IPv6HTTPServer((address, port), handler)