set (no) Referrer-Policy tomcat 9

I am trying to disable sending referrer information to other website's on a tomcat 9.x webserver. I searched the tomcat documentation but there was nothing to find about this specific referrer-policy.

Setting special (security) response headers is web application task. You can either create a servlet Filter that adds headers whichever you want:

public class MyFilter implements Filter
{
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
    {
        chain.doFilter(request, response);

        HttpServletResponse httpServletResponse = ((HttpServletResponse) response);
        httpServletResponse.addHeader("Referrer-Policy", "no-referrer");
    }
    // ...
}

Or if you are using Spring Security, you can use their header configuration feature:

Example XML configuration from Spring Security docs:

<http>
    <!-- ... -->

    <headers>
        <referrer-policy policy="same-origin" />
    </headers>
</http>

Example Java configuration from Spring Security docs:

@EnableWebSecurity
public class WebSecurityConfig extends
WebSecurityConfigurerAdapter {

  @Override
  protected void configure(HttpSecurity http) throws Exception {
      http
      // ...
      .headers()
          .referrerPolicy(ReferrerPolicy.SAME_ORIGIN);
  }
}