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    <p>In your filter have this line:</p> <pre><code>chain.doFilter(httpRequest, new AddExpiresHeaderResponse(httpResponse)); </code></pre> <p>Where the response wrapper looks like:</p> <pre><code>class AddExpiresHeaderResponse extends HttpServletResponseWrapper { public static final String[] CACHEABLE_CONTENT_TYPES = new String[] { "text/css", "text/javascript", "image/png", "image/jpeg", "image/gif", "image/jpg" }; static { Arrays.sort(CACHEABLE_CONTENT_TYPES); } public AddExpiresHeaderResponse(HttpServletResponse response) { super(response); } @Override public void setContentType(String contentType) { if (contentType != null &amp;&amp; Arrays.binarySearch(CACHEABLE_CONTENT_TYPES, contentType) &gt; -1) { Calendar inTwoMonths = GeneralUtils.createCalendar(); inTwoMonths.add(Calendar.MONTH, 2); super.setDateHeader("Expires", inTwoMonths.getTimeInMillis()); } else { super.setHeader("Expires", "-1"); super.setHeader("Cache-Control", "no-store, no-cache, must-revalidate"); } super.setContentType(contentType); } } </code></pre> <p>In short, this creates a response wrapper, which, on setting the content type, adds the expires header. (If you want, you can add whatever other headers you need as well). I've been using this filter + wrapper and it works.</p> <p><a href="https://stackoverflow.com/questions/2563344/how-to-add-response-headers-based-on-content-type-getting-content-type-before-th">See this question</a> on one specific problem that this solves, and the original solution by BalusC.</p>
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    1. COAlternatively, if you have all those files in a common folder, e.g. `/static`, then just map the filter on an `url-pattern` of `/static/*` so that you don't need to check the content type everytime and can just set the response headers directly.
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