There are certain scenarios where it's just not possible to collect information about an error on your site. If your DNS isn't resolving, for example, then the user will see a full page warning and never make it to your site. Up until now you couldn't know that user experienced that issue, but NEL changes that.
Related Products
OCSP Expect-Staple
HPKP Reports
Network Error logging allows you to gather information from countless scenarios when the user can't even connect to your site! Ops and SREs need reports from NEL as they cover DNS, TCP, HTTP and more, including reports about:
DNS server unreachable
DNS name not resolved
DNS lookup failed
TCP connection timeout/refused/reset/closed
TLS Certificate expired/wrong name/revoked
TLS protocol/cipher errors
HTTP errors, 4xx or 5xx
HTTP redirect loop
HTTP response invalid
Every single visitor to your site could immediately and reliably inform you of problems they encounter, without having to lift a finger.
If the user encounters any of the countless errors that NEL covers, a report will be dispatched by their browser, giving you all of the details you need.
You don't need 3rd party services and servers to monitor your DNS, uptime or application error rates, there are millions of browsers that can help you. The second a visitor sees an error message like this on your site, you'll know about it.
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Best Emerging Technology 2018
"This is a completely new source of information that sites can use to better protect themselves and their visitors"
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