docs: public String getInitParameter(String pName, int pScope) {
          switch (pScope) {
              case PageContext.PAGE_SCOPE:
                  return getServletConfig().getInitParameter(pName);
              case PageContext.APPLICATION_SCOPE:
                  return getServletContext().getInitParameter(pName);
              default:
                  throw new IllegalArgumentException("Illegal scope.");
          }
      }