Spring – Modifying headers for every request after processing (in postHandle)

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It sounds like you’re on the right track with a servlet filter, what you probably need to do is wrap the servlet response object with one that detects when a 401 status code has been set and adds your custom header at that time:

HttpServletResponse wrappedResponse = new HttpServletResponseWrapper(response) {

  public void setStatus(int code) {
    super.setStatus(code);
    if(code == 401) handle401();
  }

  // three similar methods for the other setStatus and the two
  // versions of sendError

  private void handle401() {
    this.addHeader(...);
  }
};

filterChain.doFilter(request, wrappedResponse);

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