var buf bytes.Buffer
		enc := json.NewEncoder(&buf)
		for {
			select {
			case <-doneCh:
				return
			case v, ok := <-subChT:
				if !ok {
					return
				}
				buf.Reset()
				err := enc.Encode(v)
				if err != nil {
					return
				}

				select {
				case subCh <- append(GetByteBuffer()[:0], buf.Bytes()...):
					continue
				case <-doneCh:
					return
				}
			}
		}

- `X-Amz-Server-Side-Encryption-Customer-Key`: Base64 encoded new key.
- `X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key`: Base64 encoded current key.

Such a special COPY request is also known as S3 SSE-C key rotation.

### Server-Side Encryption with a KMS

    void testWriteUShortNegative() {
        byte[] dest = new byte[2];
        NtlmMessage.writeUShort(dest, 0, -2);
        assertArrayEquals(new byte[] { -2, -1 }, dest, "Negative short should be encoded unsigned");
    }

    @Test
    @DisplayName("writeSecurityBuffer writes zero length buffer unchanged")
    void testWriteSecurityBufferZeroLength() {
        byte[] dest = new byte[10];

{* ../../docs_src/stream_json_lines/tutorial001_py310.py ln[27:30] hl[28] *}

### Sem tipo de retorno { #no-return-type }

Você também pode omitir o tipo de retorno. O FastAPI então usará o [`jsonable_encoder`](./encoder.md) para converter os dados em algo que possa ser serializado para JSON e depois enviá-los como JSON Lines.

{* ../../docs_src/stream_json_lines/tutorial001_py310.py ln[33:36] hl[34] *}

    public int size() {
        // Context header (16) + name length (4) + padding to 8-byte alignment (4) + data (32)
        return 16 + 4 + 4 + STRUCTURE_SIZE;
    }

    @Override
    public int encode(byte[] dst, int dstIndex) {
        int start = dstIndex;

        // Write context header
        SMBUtil.writeInt4(0, dst, dstIndex); // Next (offset to next context, 0 for last)
        dstIndex += 4;

        System.arraycopy(this.fileId, 0, dst, dstIndex, 16);
        dstIndex += 16;

        SMBUtil.writeInt2(dstIndex - getHeaderStart(), dst, bufferOffsetOffset);
        final int len = this.info.encode(dst, dstIndex);
        SMBUtil.writeInt4(len, dst, bufferLengthOffset);
        dstIndex += len;
        return dstIndex - start;
    }

    /**
     * {@inheritDoc}
     *

	if err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	// Call site replication hook.
	//
	// We encode the xml bytes as base64 to ensure there are no encoding
	// errors.
	cfgStr := base64.StdEncoding.EncodeToString(configData)
	replLogIf(ctx, globalSiteReplicationSys.BucketMetaHook(ctx, madmin.SRBucketMeta{

	values.Set("client_id", clientID)
	values.Set("client_secret", clientSecret)
	values.Set("grant_type", "client_credentials")

	req, err := http.NewRequest(http.MethodPost, k.oeConfig.TokenEndpoint, strings.NewReader(values.Encode()))
	if err != nil {
		return err
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	resp, err := k.client.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

  return IdnaMappingTableData(
    sections = sectionIndexBuffer.readUtf8(),
    ranges = rangesBuffer.readUtf8(),
    mappings = mappingsBuffer.toString(),
  )
}

/**
 * If [mapping] qualifies to be encoded as [MappedRange.InlineDelta] return new instance, otherwise null.
 * An [MappedRange.InlineDelta] must be a mapping from a single code-point to a single code-point with a difference
 * that can be represented in 2^18-1.
 */

因为这个函数不是异步的，合适的返回类型是 `Iterable[Item]`：

{* ../../docs_src/stream_json_lines/tutorial001_py310.py ln[27:30] hl[28] *}

### 无返回类型 { #no-return-type }

你也可以省略返回类型。此时 FastAPI 会使用 [`jsonable_encoder`](./encoder.md) 将数据转换为可序列化为 JSON 的形式，然后以 JSON Lines 发送。

{* ../../docs_src/stream_json_lines/tutorial001_py310.py ln[33:36] hl[34] *}

## 服务器发送事件（SSE） { #server-sent-events-sse }