gateway-provider-security-clientcert/src/main/java/org/apache/knox/gateway/clientcert/filter/ClientCertFilter.java [114:141]:
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  private void continueWithEstablishedSecurityContext(Subject subject, final HttpServletRequest request,
                                                      final HttpServletResponse response, final FilterChain chain)
      throws IOException, ServletException {
    try {
      Subject.doAs(
          subject,
          new PrivilegedExceptionAction<Object>() {
            @Override
            public Object run() throws Exception {
              chain.doFilter(request, response);
              return null;
            }
          }
      );
    }
    catch (PrivilegedActionException e) {
      Throwable t = e.getCause();
      if (t instanceof IOException) {
        throw (IOException) t;
      }
      else if (t instanceof ServletException) {
        throw (ServletException) t;
      }
      else {
        throw new ServletException(t);
      }
    }
  }
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gateway-provider-security-authc-remote/src/main/java/org/apache/knox/gateway/filter/RemoteAuthFilter.java [295:322]:
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  private void continueWithEstablishedSecurityContext(Subject subject, final HttpServletRequest request,
                                                      final HttpServletResponse response, final FilterChain chain)
          throws IOException, ServletException {
    try {
      Subject.doAs(
              subject,
              new PrivilegedExceptionAction<Object>() {
                @Override
                public Object run() throws Exception {
                  chain.doFilter(request, response);
                  return null;
                }
              }
      );
    }
    catch (PrivilegedActionException e) {
      Throwable t = e.getCause();
      if (t instanceof IOException) {
        throw (IOException) t;
      }
      else if (t instanceof ServletException) {
        throw (ServletException) t;
      }
      else {
        throw new ServletException(t);
      }
    }
  }
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