我是相当新的API的，我试图创建一个小的网络应用程序利用达芬奇文本模型。
我觉得我在设置API时每一步都做对了，但是我得到了一个错误消息：

{
    "error": {
        "message": "You didn't provide an API key. You need to provide your API key in an Authorization header using Bearer auth (i.e. Authorization: Bearer YOUR_KEY), or as the password field (with blank username) if you're accessing the API from your browser and are prompted for a username and password. You can obtain an API key from https://beta.openai.com.",
        "type": "invalid_request_error",
        "param": null,
        "code": null
    }
}

下面是我为它设置的函数：

const [input, setInput] = useState("");

  async function fetchAnswer() {
    const res = await fetch("https://api.openai.com/v1/completions", {
      method: "POST",
      headers: {
        "Content-Type": "applications/json",
        Authorization:
          "Bearer MY_API_KEY",
      },
      body: JSON.stringify({
        model: "text-davinci-003",
        prompt: "Create a lyric that rhymes with:" + input,
        temperature: 1,
      }),
    });
    const json = await res.json();
    console.log(json);
  }

显然，我不会共享API密钥，但我可以确认我复制并粘贴到函数中的API密钥是正确的，并且直接来自OpenAI提供给我的内容。
我还漏掉了什么吗？