UnsupportedMediaTypeFilter.java

package com.snaphop.spring;

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.http.MediaType;
import org.springframework.web.filter.OncePerRequestFilter;


public class BadMediaTypeFilter extends OncePerRequestFilter {

	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
			throws ServletException, IOException {
		String mediaTypes = request.getHeader("Accept");
		if (mediaTypes != null) {
			try {
				MediaType.parseMediaTypes(mediaTypes);
			} catch (IllegalArgumentException e) {
				//You can't send an error because Spring's RequestMapping will fail render the error template.
				//response.sendError(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE, "Bad Accept Header");
				response.setStatus(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE);
				response.setContentType("text/plain");
				response.getWriter().append("Aww Snap! You gave us a naughty Accept Header: '" + mediaTypes + "'.\n");
				response.flushBuffer();
				
				return;
			}
		}
		filterChain.doFilter(request, response);
		return;
	}
	

}