Public

I'm getting a CORS error for the URL.

Thanks for reporting this. So do I. I’ll look into it. Suspect it’s either a change at RIVM or Observable.

I can simply visit https://data.rivm.nl/covid-19/COVID-19_reproductiegetal.json and get the data. Just not from a notebook. Observable change?

No. Rvim.nl serves the URL without an "access-control-allow-origin" header, hence the CORS error.

Hmmm… okay. Since it has been working fine until recently, where and what has changed then? I’m certain it’s not my notebook. Should I contact RIVM and ask them to make their data CORS compliant?

Ha! It disappears when I Safari » Develop » Disable Cross-Origin Restrictions. But that doesn’t seem the right way to go.

Only if you're the only one who views your notebooks ;) You could either attach the data to the notebook, or load it via a CORS proxy that adds the required headers.

Yes. The retrieved header (served by httpd) says: Referrer-Policy: strict-origin-when-cross-origin. Adding it to the notebook: stale data; This data gets refreshed by the source every so many days. CORS proxy will work, yet I find it a kludge. I’ll contact RIVM.

Nov 17, 2021

This ain’t over yet. RIVM replied: “probably destination has a lower security level than that being used for RIVM’s open data”. Will investigate further Thu/Fri. Had no time on Wed/Thu.

Comments (9)

I'm getting a CORS error for the URL.

Thanks for reporting this. So do I. I’ll look into it. Suspect it’s either a change at RIVM or Observable.

I can simply visit https://data.rivm.nl/covid-19/COVID-19_reproductiegetal.json and get the data. Just not from a notebook. Observable change?

No. Rvim.nl serves the URL without an "access-control-allow-origin" header, hence the CORS error.

Ha! It disappears when I Safari » Develop » Disable Cross-Origin Restrictions. But that doesn’t seem the right way to go.

Only if you're the only one who views your notebooks ;) You could either attach the data to the notebook, or load it via a CORS proxy that adds the required headers.