assertTrue(processor.isNotModified(responseData));

        responseData.setHttpStatusCode(100);
        assertFalse(processor.isNotModified(responseData));
        responseData.setHttpStatusCode(200);
        assertFalse(processor.isNotModified(responseData));
        responseData.setHttpStatusCode(404);
        assertFalse(processor.isNotModified(responseData));
    }

    UNSUPPORTED_URL_AT_CRAWLING_STARTED,
    /** Indicates checking the last modified date of a resource. */
    CHECK_LAST_MODIFIED,
    /** Indicates the resource has not been modified. */
    NOT_MODIFIED,
    /** Indicates getting content from a resource. */
    GET_CONTENT,
    /** Indicates a redirect location was found. */
    REDIRECT_LOCATION,
    /** Indicates processing a response. */
    PROCESS_RESPONSE,