docs: public final static String getHeaderIgnoreCase(HttpServletRequest request, String nameIgnoreCase) {
  		Enumeration<String> names = request.getHeaderNames();
  		String name = null;
  		while (names.hasMoreElements()) {
  			name = names.nextElement();
  			if (name != null && name.equalsIgnoreCase(nameIgnoreCase)) {
  				return request.getHeader(name);
  			}
  		}
  
  		return null;
  	}