*/
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 code for service unavailable (HTTP 502/503). */

						evaluate: '<la:message key="labels.chat_phase_evaluate" />',
						fetch: '<la:message key="labels.chat_phase_fetch" />',
						answer: '<la:message key="labels.chat_phase_answer" />'
					},
					errors: {
						rate_limit: '<la:message key="labels.chat_error_rate_limit" />',
						auth_error: '<la:message key="labels.chat_error_auth" />',
						service_unavailable: '<la:message key="labels.chat_error_service_unavailable" />',

        assertEquals(LlmException.ERROR_AUTH, exception.getErrorCode());
        assertSame(cause, exception.getCause());
    }

    @Test
    public void test_errorCodeConstants() {
        assertEquals("rate_limit", LlmException.ERROR_RATE_LIMIT);
        assertEquals("auth_error", LlmException.ERROR_AUTH);
        assertEquals("service_unavailable", LlmException.ERROR_SERVICE_UNAVAILABLE);

                evaluate: 'Evaluating results...',
                fetch: 'Retrieving content...',
                answer: 'Generating answer...'
            },
            errors: {
                rate_limit: 'It\'s currently busy. Please wait a moment and try again.',
                auth_error: 'AI service authentication failed. Please contact the administrator.',

        if (typeof options.maxSpan === 'object')
            this.maxSpan = options.maxSpan;

        if (typeof options.dateLimit === 'object') //backwards compat
            this.maxSpan = options.dateLimit;

        if (typeof options.opens === 'string')
            this.opens = options.opens;

        if (typeof options.drops === 'string')