{* ../../docs_src/json_base64_bytes/tutorial001_py310.py ln[1:9,29:35] hl[9] *}

`/docs`를 확인하면 `data` 필드가 base64로 인코딩된 bytes를 기대한다고 표시됩니다:

<div class="screenshot">
<img src="/img/tutorial/json-base64-bytes/image01.png">
</div>

아래와 같은 요청을 보낼 수 있습니다:

```json
{
    "description": "Some data",
    "data": "aGVsbG8="
}
```

/// tip | 팁

`aGVsbG8=`는 `hello`의 base64 인코딩입니다.

///

        byte[] data = "test content".getBytes();
        ContentCache cache = new ContentCache(data);
        response.setContentCache(cache);

        try (InputStream stream = response.getContentAsStream()) {
            assertNotNull(stream);
            byte[] buffer = new byte[1024];
            int bytesRead = stream.read(buffer);
            assertEquals(data.length, bytesRead);

   * (byte[]) data.
   */
  T getExpected(T data);

  /** Cleans up anything created when creating the source or sink. */
  void tearDown() throws IOException;

  /** Factory for byte or char sources. */
  interface SourceFactory<S, T> extends SourceSinkFactory<S, T> {

    /** Creates a new source containing some or all of the given data. */
    S createSource(T data) throws IOException;
  }

        return this.fileId;
    }

    /**
     * Gets the decoded output data from the response.
     *
     * @return the outputData
     */
    public Decodable getOutputData() {
        return this.outputData;
    }

    /**
     * Gets the length of the output data.
     *
     * @return the outputLength
     */
    public int getOutputLength() {

            hmac.engineUpdate(data, 0, data.length);
            byte[] result = hmac.engineDigest();

            assertArrayEquals(expected, result);
        }
    }

    @Test
    void testHMACT64WithEmptyData() throws NoSuchAlgorithmException {
        // Test with empty data
        byte[] key = "key".getBytes();
        byte[] data = EMPTY_DATA;

        // Create a simple message with 3 bytes of data
        byte[] data = new byte[] { 1, 2, 3 };
        byte[] fullData = concat(messageHeader(3), data);
        InputStream in = new ByteArrayInputStream(fullData);
        SocketInputStream sis = new SocketInputStream(in);

        // Read the three data bytes
        assertEquals(1, sis.read());
        assertEquals(2, sis.read());

        byte[] key = new byte[16];
        Arrays.fill(key, (byte) 0x0b);
        byte[] data = "Hi There".getBytes();

        // Expected result calculated manually for HMACT64 with this key and data
        HMACT64 hmac = new HMACT64(key);
        hmac.engineUpdate(data, 0, data.length);
        byte[] result = hmac.engineDigest();

        // Verify it produces a valid MD5 hash (16 bytes)

def test_post_body(client: TestClient):
    data = [
        {"url": "http://example.com/", "name": "Example"},
        {"url": "http://fastapi.tiangolo.com/", "name": "FastAPI"},
    ]
    response = client.post("/images/multiple", json=data)
    assert response.status_code == 200, response.text
    assert response.json() == data


def test_post_invalid_list_item(client: TestClient):
    data = [{"url": "not a valid url", "name": "Example"}]

def test_post_body(client: TestClient):
    data = {"2": 2.2, "3": 3.3}
    response = client.post("/index-weights/", json=data)
    assert response.status_code == 200, response.text
    assert response.json() == data


def test_post_invalid_body(client: TestClient):
    data = {"foo": 2.2, "3": 3.3}
    response = client.post("/index-weights/", json=data)
    assert response.status_code == 422, response.text

    /**
     * Establish RDMA connection
     */
    public abstract void connect() throws IOException;
    
    /**
     * Send data using RDMA
     */
    public abstract void send(ByteBuffer data, RdmaMemoryRegion region) throws IOException;
    
    /**
     * Receive data using RDMA  
     */
    public abstract ByteBuffer receive(int timeout) throws IOException;
    
    /**