我有一个带有React组件的ExpressJs服务器。服务器应该处理来自外部的请求，一个请求应该在当前不播放时播放Spotify API中的一首歌。

app.post("/play", (req, res) => {
  try {
    // requesting to play uses query params
    id = req.query.id;
    currPlayingID = 0;

    // get the currently playing song from the SPotify API
    axios({
      url: "https://api.spotify.com/v1/me/player/currently-playing",
      method: "get",
      headers: {
        authorization: `Bearer ${access_token}`,
      },
    })
      // set the currently Playing ID or to zero if nothing is playing
      .then((response) => {
        if (response.data !== null) {
          currPlayingID = response.data.id;
        } else {
          currPlayingID = 0;
        }
      });

    // only play the song if its not currently playing
    if (id !== currPlayingID) {
      // making a axios request to the Spotify API to play the Song with the ID
      axios({
        url: "https://api.spotify.com/v1/me/player/play/",
        method: "put",
        headers: {
          authorization: `Bearer ${access_token}`,
        },
        data: {
          uris: [`spotify:track:${id}`],
        },
      });
      res.status(204);
    }
  } catch (error) {
    res
      .status(404)
      .json({ message: "Couldn't get Info from Spotify API", error: error });
  }
});

问题：
当我在设备本身上启动服务器时，代码工作（所以在我的桌面PC上的本地服务器），但当我在我的RaspberryPI上启动服务器时，我无法处理到此端点的请求/播放.是的，我更新了所有的IP地址，无处不在.
但更有趣的部分是使用React客户端，我收到以下错误：

Failed to load resource: net::ERR_CONNECTION_REFUSED

向POSTMAN请求，我得到以下信息：

Mixed Content Error: The request has been blocked because it requested an insecure HTTP resource

在服务器端，我使用python脚本从一个请求中获得：

[UnhandledPromiseRejection: This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason "AxiosError: Request failed with status code 400".] {
  code: 'ERR_UNHANDLED_REJECTION'
}

我不知道如何修复每个错误，如果它是一个修复。基本上我发现这是一个问题，拒绝请求从外部localhost，因为与cURL在我的ssh终端上它的工作。