code: @SuppressWarnings("rawtypes")
  	private void restoreFromCookie(IExtendedRequest extRequest, HttpServletResponse res, String reqURL) {
  		byte[] cookieValueBytes = extRequest.getCookieValueAsBytes(POSTPARAM_COOKIE);
  		if (cookieValueBytes == null || cookieValueBytes.length <= 2) {
  			return;
  		}
  		if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
  			Tr.debug(tc, "Found the cookie, restoring POST parameters: " + new String(cookieValueBytes));
  		}
  		try {
  			HashMap restoredParams = deserializePostParam(extRequest, cookieValueBytes, reqURL);
  			extRequest.setInputStreamData(restoredParams);
  			extRequest.setMethod("POST");
  		} catch (Exception e) {
  			if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
  				Tr.debug(tc, "Exception restoring POST parameters from the cookie: ", new Object[] { e });
  			}
  		}
  		Cookie paramCookie = new Cookie(POSTPARAM_COOKIE, "");
  		paramCookie.setPath(reqURL);
  		paramCookie.setMaxAge(0);
  		if (webAppSecurityConfig.getHttpOnlyCookies()) {
  			paramCookie.setHttpOnly(true);
  		}
  		if (webAppSecurityConfig.getSSORequiresSSL()) {
  			paramCookie.setSecure(true);
  		}
  		res.addCookie(paramCookie);
  	}
docs: Restore POST parameter from cookie
  
  @param extRequest
  @param res
  @param reqURL