404. That’s an error.
The requested URL /hg-history/2470bd80abf47420d8788e86311515f54ce60f4f/AppKit/NSTokenField.h was not found on this server. That’s all we know.
/hg-history/2470bd80abf47420d8788e86311515f54ce60f4f/AppKit/NSTokenField.h