Describe the bug
Cannot show /openapi.html
when running viewer/server from Jupyter.
To Reproduce
In Jupyter NB:
viewer = Viewer()
viewer.add_dataset(ds)
viewer.show()
Click server URL and change URL to */openapi.html
Expected behavior
xcube server APIs should be displayed.
Screenshots
![image](https://private-user-images.githubusercontent.com/206773/337318632-89e3b2f8-1711-40f8-be1c-0d7965ff76b7.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MjAwNDg5MDAsIm5iZiI6MTcyMDA0ODYwMCwicGF0aCI6Ii8yMDY3NzMvMzM3MzE4NjMyLTg5ZTNiMmY4LTE3MTEtNDBmOC1iZTFjLTBkNzk2NWZmNzZiNy5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjQwNzAzJTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI0MDcwM1QyMzE2NDBaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1hNGEzMzQ2MTIyMjFhODZhMTNiYTZiZTg5M2U4ZGIwZjg3NjU5NWExM2Y2ZjZiMTFiMTMwMTZjY2FhZmViODNhJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCZhY3Rvcl9pZD0wJmtleV9pZD0wJnJlcG9faWQ9MCJ9.obaKeOqsR_60lm42yPaEj9pFs4ssGRftjT_ZzjiJqc0)