This post originated from an RSS feed registered with Java Buzz by Nick Lothian. Original Post: Switched to Feedburner Feed Title: BadMagicNumber Feed URL: http://feeds.feedburner.com/Badmagicnumber Feed Description: Java, Development and Me Latest Java Buzz Posts Latest Java Buzz Posts by Nick Lothian Latest Posts From BadMagicNumber

I've switched my feeds at my BadMagicNumber blog to be published via FeedBurner. There should be no disruption to your normal programming, although I think some aggregators will show some non-new items as new.

I switched the feeds over using a simple Servlet Filter. If anyone wants to do the same, here's the code. This works for blojsom, but you might need to modify it slightly for your own setup.

public class FeedBurnerRedirectFilter implements Filter {
	private String redirectURL;
	
	public void init(FilterConfig config) throws ServletException {
		redirectURL = config.getInitParameter("redirectURL");		
	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) 
						throws IOException, ServletException {
		String flavor = request.getParameter("flavor"); 
		
		if ("atom".equals(flavor) || "rss".equals(flavor) 
				|| "rss2".equals(flavor) || "rdf".equals(flavor) ) {			
			HttpServletRequest httpRequest = (HttpServletRequest) request;			
			HttpServletResponse httpResponse = (HttpServletResponse) response;
			
			String userAgent = httpRequest.getHeader("User-Agent");
			if (userAgent != null && userAgent.indexOf("FeedBurner") < 0) {
				/// redirect if not feedburner
				httpResponse.sendRedirect(redirectURL);
				return;				
			}
			
		}		
		chain.doFilter(request, response);		
	}

	public void destroy() {
		
	}
}