404. That’s an error.
The requested URL /media/www.google.com/en//events/io/2011/static/presofiles/drfibonacci_devtools_high_performance_gwt.pdf was not found on this server. That’s all we know.
/media/www.google.com/en//events/io/2011/static/presofiles/drfibonacci_devtools_high_performance_gwt.pdf