code: protected String rewriteUrl(GeneratorContext context, String content) throws IOException {
  
  		JawrConfig jawrConfig = context.getConfig();
  		CssImageUrlRewriter rewriter = new CssImageUrlRewriter(jawrConfig);
  		String bundlePath = PathNormalizer.joinPaths(jawrConfig.getServletMapping(), ResourceGenerator.CSS_DEBUGPATH);
  
  		StringBuffer result = rewriter.rewriteUrl(context.getPath(), bundlePath, content);
  		return result.toString();
  	}
docs: Rewrite the URL for debug mode
  
  @param context
  the generator context
  @param content
  the content
  @return the rewritten content
  @throws IOException
  if IOException occurs