// Verify attributes are masked with 0x37
        int expectedAttributes = searchAttributes & 0x37;

        // Write parameters to verify the masked value is used
        byte[] buffer = new byte[100];
        int written = trans2FindFirst2.writeParametersWireFormat(buffer, 0);

        // Read back the search attributes

## 試試看 { #try-it }

如果你的檔案名為 `main.py`，用以下指令執行應用：

<div class="termy">

```console
$ fastapi dev

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

在瀏覽器開啟 [http://127.0.0.1:8000](http://127.0.0.1:8000)。

你會看到一個像這樣的簡單頁面：

<img src="/img/tutorial/websockets/image01.png">

你可以在輸入框輸入訊息並送出：

    assertThat(connection.writer.maxDataLength()).isEqualTo(newMaxFrameSize)
  }

  /**
   * Webservers may set the initial window size to zero, which is a special case because it means
   * that we have to flush headers immediately before any request body can be sent.
   * https://github.com/square/okhttp/issues/2543
   */
  @Test fun peerSetsZeroFlowControl() {
    peer.setClient(true)

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 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
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