// DFS path offset (2 bytes) - points to string data
        SMBUtil.writeInt2(stringDataStart - 8, buffer, 20); // Offset from start of referral

        // DFS alternate path offset (2 bytes)
        SMBUtil.writeInt2(0, buffer, 22);

        // Network address offset (2 bytes)
        SMBUtil.writeInt2(0, buffer, 24);

        // Padding to align string data
        buffer[26] = 0;
        buffer[27] = 0;

            generated OpenAPI, but currently it doesn't affect the parsing of the data.
            """
        ),
    ] = "multipart/form-data",
    alias: Annotated[
        str | None,
        Doc(
            """
            An alternative name for the parameter field.

            This will be used to extract the data and for the generated OpenAPI.

    return id


@app.get("/items/")
async def read_items(
    id: Annotated[str | None, AfterValidator(check_valid_id)] = None,
):
    if id:
        item = data.get(id)
    else:
        id, item = random.choice(list(data.items()))

    }

    /**
     * Converts a byte array to a hexadecimal string representation.
     *
     * @param data the byte array to convert
     * @return a hexadecimal string representation of the entire byte array
     */
    public static String toHexString(final byte[] data) {
        return toHexString(data, 0, data.length);
    }

    /**
     * This is the same as {@link jcifs.util.Hexdump#toHexString(int val, int

     * Decode a list of AvPairs
     *
     * @param data the encoded AV pairs data
     * @return individual pairs
     * @throws CIFSException if decoding fails
     */
    public static List<AvPair> decode(final byte[] data) throws CIFSException {
        final List<AvPair> pairs = new LinkedList<>();
        int pos = 0;
        boolean foundEnd = false;
        while (pos + 4 <= data.length) {

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

「/docs」を確認すると、`data` フィールドが base64 でエンコードされたバイト列を期待していることが表示されます。

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

次のようなリクエストを送れます:

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

/// tip | 豆知識

`aGVsbG8=` は `hello` の base64 エンコードです。

///

            writeLittleEndianLong(baos, 104); // offset (aligned)

            // Add buffer data
            while (baos.size() < 72) {
                baos.write(0);
            }
            // LOGON_INFO data (minimal)
            baos.write(new byte[8]);

            // SERVER_CHECKSUM data
            writeLittleEndianInt(baos, PacSignature.KERB_CHECKSUM_HMAC_MD5);
            baos.write(mockChecksum);

            searchPaging(data, form);
        });
    }

    /**
     * Sets up data for search result pagination.
     *
     * @param data the render data
     * @param form the search form
     */
    protected void searchPaging(final RenderData data, final SearchForm form) {

   * block of data for communication purposes. ETB is used for blocking data where the block
   * structure is not necessarily related to the processing format.
   *
   * @since 8.0
   */
  public static final byte ETB = 23;

  /**
   * Cancel: A control character used to indicate that the data with which it is sent is in error or
   * is to be disregarded.
   *

This gives you a lot of **flexibility**. You can return any data type, override any data declaration or validation, etc.

It also gives you a lot of **responsibility**. You have to make sure that the data you return is correct, in the correct format, that it can be serialized, etc.

## Using the `jsonable_encoder` in a `Response` { #using-the-jsonable-encoder-in-a-response }