Error even when connection was successful

Here is what I got when I try to connect to EventMesh Admin Endpoint, but it seems that the connection was actually successful?
```
Failed to connect to http://localhost:10106
Network Error
```

To reproduce is easy, just run the following commands:

```bash
docker run -d --name eventmesh -p 10000:10000 -p 10105:10105 -p 10205:10205 -p 10106:10106 -t apache/eventmesh:latest

cd ./path-to-eventmesh-dashboard
npm run dev
```

Start by running the provided Docker command for EventMesh and `npm run dev` in the dashboard, then reproduce the connection message for `http://localhost:10106`. Trace how the dashboard checks the Admin Endpoint and reports the result; done means a successful connection is no longer shown as a network error.

Written by the indexing model from the issue text.