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Tomcat seems to send an ETag header with each response by default. I'd like to disable these for reasons outlined here. I know I can strip them out in my Apache configuration, but is there any way to disable them on the Tomcat side?

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up vote 7 down vote accepted

No way disable out of the box. But ETags are set by the DefaultServlet via request.setHeader(). So an easy workaround to disable them is to create a filter for DefaultServlet which swallows the tag. For example:

void doFilter(ServletRequest request, ServletRequest reponse) {
  chain.doFilter(request, new HttpServletResponseWrapper(response) {
      public void setHeader(String name, String value) {
          if (!"etag".equalsIgnoreCase(name)) {
              super.setHeader(name, value);

And in web.xml:

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