Use NEL to detect site censorship

[fortuna]

It's useful to know whether a site is blocked in a place, and how it's blocked.

The new Network Error Logging standard is implemented by Chrome can help with that. It's effectively a way for the browser to report errors when connecting to your site.

I know of a couple of services running report collectors:

• https://www.uriports.com/getting-started#nel
• https://report-uri.com/products/network_error_logging

If you want to run your own collector, there's an open source version, but you would have to run it on separate infrastructure that is not blocked.