| Class | Description | 
|---|---|
| ChartDoSFilter | Protect the /chart endpoint from too many requests. | 
| ChartServlet | A reimplementation of the
 
 Google Chart Server's QR code encoder, which is now deprecated. | 
| DecodeDoSFilter | Protect the /decode endpoint from too many requests. | 
| DecodeServlet | HttpServletwhich decodes images containing barcodes. | 
| DoSFilter | A simplistic  Filterthat rejects requests from hosts that are sending too many
 requests in too short a time. | 
| HTTPSFilter | Redirects things to HTTPS, like the main decode page, which should prefer HTTPS. | 
| OutputUtils | Utility functions for  decoderesult.jspx. | 
| WelcomeFilter | Handles redirects to the app landing page. | 
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