Checking this plugin without deploying: CORS issues and RTD PR integration

[rth]

Thanks for this package!

I was just wondering how would one check that it's working as expected without deploying.

• If I build the doc locally, I get the following error,

  Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at file:///..../docs/_build/html/_static/data/versionwarning-data.json. (Reason: CORS request not http)
  

• If I build it locally, served via python -m http.server I get,

  Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://readthedocs.org/api/v2/version/?project__slug=&active=true. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing)
  

• I build it via ReadTheDocs PR integration in DOC Make dev documentation consistent + version warnings pyodide/pyodide#1479 the console shows,

  Running version: 1479
  getHighestVersion
  

  but that's not really sufficient to determine what would be the latest version linked, and the banner is not shown since there is already a banner injected by RTD.

Eventually I could test it by deploying the docs as latest, but I would also like to check that for older versions the redirected version is stable not latest and it seems that that's not possible, without actually releasing 2 versions, unless I'm missing something?

Maybe increasing the verbosity of console logging would already help.