}
        return false;
    }

    /**
     * Sends a 429 JSON response for API requests.
     * @param response the HTTP response
     * @throws IOException if an I/O error occurs
     */
    protected void sendApiResponse(final HttpServletResponse response) throws IOException {
        response.setStatus(429);
        response.setContentType("application/json;charset=UTF-8");

        mockRequest.setRequestURI("/search");

        testableFilter.doFilter(mockRequest, mockResponse, mockFilterChain);

        assertFalse(mockFilterChain.wasDoFilterCalled());
        assertEquals(429, mockResponse.getSendErrorCode());
    }

    @Test
    public void test_doFilter_webAtThreshold() throws IOException, ServletException {
        setConfig(80, 100);
        testableFilter.setCpuPercent((short) 80);

package org.codelibs.fess.app.web.error;

import org.codelibs.fess.app.web.base.FessSearchAction;
import org.lastaflute.web.Execute;
import org.lastaflute.web.response.HtmlResponse;

/**
 * Action class for handling HTTP 429 Too Many Requests error pages.
 * This action displays error pages when the server is under high load.
 */
public class ErrorBusyAction extends FessSearchAction {

    /**
     * Default constructor for ErrorBusyAction.

 *
 * @author FessProject
 */
public class LlmException extends FessSystemException {

    private static final long serialVersionUID = 1L;

    /** Error code for rate limit (HTTP 429). */
    public static final String ERROR_RATE_LIMIT = "rate_limit";

    /** Error code for authentication failure (HTTP 401/403). */
    public static final String ERROR_AUTH = "auth_error";

  </error-page>
  <error-page>
    <error-code>408</error-code>
    <location>/WEB-INF/view/error/redirect.jsp?type=logOut</location>
  </error-page>
  <error-page>
    <error-code>429</error-code>
    <location>/WEB-INF/view/error/redirect.jsp?type=busy</location>
  </error-page>
  <error-page>
    <error-code>500</error-code>
    <location>/WEB-INF/view/error/redirect.jsp?type=systemError</location>

max.log.output.length=4000
# Adaptive load control value.
adaptive.load.control=50
# CPU threshold (%) for web request load control. Returns 429 when CPU >= this value. (100: disabled)
web.load.control=100
# CPU threshold (%) for API request load control. Returns 429 when CPU >= this value. (100: disabled)
api.load.control=100
# Interval (seconds) for monitoring OpenSearch CPU load.
load.control.monitor.interval=1

     *
     * @param statusCode the HTTP status code
     * @return the corresponding error code
     */
    protected String resolveErrorCode(final int statusCode) {
        if (statusCode == 429) {
            return LlmException.ERROR_RATE_LIMIT;
        }
        if (statusCode == 401 || statusCode == 403) {
            return LlmException.ERROR_AUTH;
        }
        if (statusCode == 404) {

    /**
     * Get the value for the key 'web.load.control'. <br>
     * The value is, e.g. 100 <br>
     * comment: CPU threshold (%) for web request load control. Returns 429 when CPU &gt;= this value. (100: disabled)
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getWebLoadControl();

    /**