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    <p>Take a look at <a href="http://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletResponseWrapper.html" rel="nofollow">HttpServletResponseWrapper</a>.</p> <hr> <p><em><strong>Okay, then code:</em></strong></p> <p>This code buffers the output (in two fashions) so adding the header after the pseudo-output works. Actually addHeader could have been implemented by outputting, so we are <em>lucky</em> it works. Border-case code. If unlucky, addHeader would have to be overriden.</p> <p>Mind, when I tried, only getOutputStream was called in my test app. There is a choice to be made either electing getPrintWriter or getOutputStream.</p> <pre><code>private static class PostponingResponseWrapper extends HttpServletResponseWrapper { private ByteArrayOutputStream bos; private ServletOutputStream outputStream; private StringWriter sw; private PrintWriter printWriter; private boolean usingOutputStream; private boolean usingWriter; public PostponingResponseWrapper (HttpServletResponse response) { super(response); bos = new ByteArrayOutputStream(); outputStream = new ServletOutputStream() { @Override public void write(int b) throws IOException { bos.write(b); } }; sw = new StringWriter(); printWriter = new PrintWriter(sw); } @Override public PrintWriter getWriter() throws IOException { usingWriter = true; LOGGER.info("getWriter usingWriter {}, usingOutputStream {}", usingWriter, usingOutputStream); return printWriter; } @Override public void flushBuffer() throws IOException { LOGGER.info("flushBuffer"); } @Override public ServletOutputStream getOutputStream() throws IOException { usingOutputStream = true; LOGGER.info("getOutputStream usingWriter {}, usingOutputStream {}", usingWriter, usingOutputStream); ServletOutputStream out = new ServletOutputStream() { @Override public void write(int b) throws IOException { outputStream.write(b); } }; return out; } public void finish() throws IOException { LOGGER.info("finish"); if (usingWriter) { super.getWriter().print(sw.toString()); } else if (usingOutputStream) { super.getOutputStream().write(bos.toByteArray()); } } } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletResponse httpServletResponse = (HttpServletResponse) response; PostponingResponseWrapper responseWrapper = new PostponingResponseWrapper (httpServletResponse); responseWrapper.addHeader("Before", "Already-Worked"); chain.doFilter(request, responseWrapper); responseWrapper.addHeader("After", "And-Now-This"); responseWrapper.finish(); // Writes the actual response } </code></pre>
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    1. POHow to use a filter to measure performance?
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    1. USJoop Eggen
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    1. CO-1 answers lik this open up more questions then they answer.
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    2. CO@YevgeniyM. you are right, should just have been a comment, that there is such a wrapper class +1.
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    3. COOk, I've implemented a solution using HttpServletResponseWrapper but still can't get it to work! I'll update the question above with my new code.
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      1. USPhil
 

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