searchRenderData.setExecTime("");
        assertEquals("", searchRenderData.getExecTime());

        // Test with formatted time string
        searchRenderData.setExecTime("0.123 sec");
        assertEquals("0.123 sec", searchRenderData.getExecTime());
    }

    @Test
    public void test_setAndGetPageSize() {
        // Test with zero
        searchRenderData.setPageSize(0);

curl "http://localhost:8080/json/?q=search&num=10"
```

**Response**:
```json
{
  "response": {
    "version": 1,
    "status": 0,
    "q": "search",
    "exec_time": 0.123,
    "page_size": 10,
    "page_number": 1,
    "record_count": 234,
    "result": [
      {
        "url": "http://example.com/page1",
        "title": "Example Page",