Hi
I sit behind a cooperate web proxy and try to run jupyter-lab inside of a docker container.
Everything works fine, besides the extensions. If I use the default npm registry (“npmRegistry”: “https://registry.npmjs.org/-/v1/”) it seams, that jupyter lab uses the proxy I configured in the browser and lists the extensions.
But if I try to install a extensions nothing happens, so I opened the chrome console and find the following error:
Access to fetch at 'https://registry.npmjs.org/@jupyterlab/apputils/3.3.2' from origin 'https://jupyterlab.mydomain.local' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
Because I thought it was a problem with the direct access through the web proxy I ordered a npm mirror which points to registry.npmjs.org, but its the same:
Access to fetch at 'https://mirror.mydomain.local/api/npm/ext-npm/search?text=+keywords%3A%22jupyterlab-extension%22&size=250&from=0' from origin 'https://jupyterlab.mydomain.local' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
If I enable CDN I get a http 500 (I guess because of the proxy) so I deactivated it.
can you tell me on how to fix this cors error? or how can I set the request’s mode to ‘no-cors’?