Example API call does not work

I am trying to evaluate the model using the example API call provided in the repo at:
https://github.com/OpenGVLab/ScaleCUA/tree/main/evaluation#putting-it-all-together-example-api-call

I get the following error:
```
curl: (52) Empty reply from server
```

I suspect that the prompt message is not correctly formatted. Can you please confirm if the provided message works correctly at your end?