Most popular variants of the header value (we only show this when there's just a bunch of variants):

Network Error Logging (NEL) defines a mechanism enabling web applications to declare a reporting policy that can be used by an user agent to report network errors for a given origin.

Reference...

We have seen 334 websites setting the NEL HTTP header and 42 unique values of this header.

  • www.bbc.co.uk {"report_to":"default","max_age":600,"include_subdomains":true,"failure_fraction":0.01}
  • bbc.co.uk {"report_to":"default","max_age":2592000,"include_subdomains":true,"failure_fraction":0.05}
  • www.bbc.com {"report_to":"default","max_age":2592000,"include_subdomains":true,"failure_fraction":0.01}
  • www.linkedin.com {"report_to":"network-errors","max_age":1296000,"success_fraction":0.00066,"failure_fraction":1,"include_subdomains":true}
  • rawgit.com {"report_to":"cf-nel","max_age":604800}
  • cdnjs.cloudflare.com {"report_to":"cf-nel","max_age":604800}
  • padlet.com {"report_to":"default","max_age":86400,"include_subdomains":true}
  • www.msn.com {"report_to":"network-errors","max_age":604800,"success_fraction":0.001,"failure_fraction":1.0}
  • www.bing.com {"report_to":"network-errors","max_age":604800,"success_fraction":0.001,"failure_fraction":1.0}
  • mnogochat.com {"report_to":"cf-nel","max_age":604800}
  • cdn.shopify.com {"report_to":"network-errors","max_age":0}
  • openmu.com {"report_to":"cf-nel","max_age":604800}
  • ak47full.com {"report_to":"cf-nel","max_age":604800}
  • nohowstyle.com {"report_to":"network-errors","max_age":2592000,"failure_fraction":0.01,"success_fraction":0.0001}
  • scotthelme.co.uk {"report_to":"default","max_age":10886400}
  • webcookies.org {"report_to": "nel", "max_age": 10886400}
  • www.heliosnet.com {"report_to":"default","max_age":31536000,"include_subdomains":true}
  • bilbaoexhibitioncentre.com {"report_to":"cf-nel","max_age":604800}
  • rsms.me {"report_to":"cf-nel","max_age":604800}
  • platform.linkedin.com {"report_to":"network-errors","max_age":1296000,"success_fraction":0.00066,"failure_fraction":1,"include_subdomains":true}
  • ajax.cloudflare.com {"report_to":"cf-nel","max_age":604800}
  • an.yandex.ru {"report_to": "network-errors", "max_age": 86400, "success_fraction": 0.001, "failure_fraction": 0.1}
  • www.mainadv.com {"report_to":"cf-nel","max_age":604800}
  • www.chaturbate.com {"report_to":"default","max_age":2592000,"include_subdomains":true}
  • static1.dmcdn.net {"report_to":"telemetry","max_age":7776000,"include_subdomains":true,"failure_fraction":1.0}