NEL

HTTP response header

Header usage statistics

NEL response header information and usage statistics.

Websites using header NEL 103,903
Percentage of websites that use NEL header 0.91%
Total discovered header values 126
Header uses directives No
Header values are unique or random No
Most popular in the country Canada

Distribution by websites popularity

NEL detection in the top websites by popularity

Top 10k sites 154 websites
Top 100k sites 2,008 websites
Top 1m sites 6,897 websites

Websites utilizing NEL

List of websites that use NEL header

Domain Country Rank Contacts
bbc.co.uk United States of America 108
www.bbc.co.uk United Kingdom 108
bbc.com United States of America 109
www.bbc.com United States of America 109
www.cloudflare.com United States of America 206
docs.microsoft.com United States of America 325
See full domain list

Geographical Distribution

Header usage distribution by websites across the globe.






Common header values

List of top common NEL header values

Header value Value prevalence
{"report_to":"network-errors","max_age":2592000,"failure_fraction":0.01,"success_fraction":0.0001} 97.92%
{"report_to":"cf-nel","max_age":604800} 0.80%
{"report_to":"default","max_age":31536000,"include_subdomains":true} 0.34%
{"report_to":"endpoint-1","max_age":14400,"include_subdomains":true,"failure_fraction":0.1} 0.15%
{"report_to":"default","max_age":2592000,"include_subdomains":true} 0.13%
{"report_to":"default","max_age":2592000,"include_subdomains":true,"failure_fraction":1.0} 0.09%
{"report_to":"default","max_age":86400,"include_subdomains":true} 0.05%
{"report_to":"network-errors","max_age":86400,"success_fraction":0.001,"failure_fraction":1.0} 0.05%
{"report_to":"network-errors","max_age":2592000,"success_fraction":0,"failure_fraction":1.0, "include_subdomains": true} 0.05%
{"report_to":"default","max_age": 604800,"include_subdomains":true,"failure_fraction":0.01} 0.04%
{"report_to": "network-errors", "max_age": 86400, "success_fraction": 0.001, "failure_fraction": 0.1} 0.03%
{''report_to'':''default'',''max_age'':31536000,''include_subdomains'':true} 0.03%
{"include_subdomains": false, "max_age": 30, "report_to": "nel-endpoint"} 0.02%
{"report_to":"NelOfficeUpload1","max_age":86400,"include_subdomains":true,"failure_fraction":1.0,"success_fraction":0.01} 0.02%
{"report_to":"default","max_age":31536000,"include_subdomains":true,"failure_fraction":1.0} 0.01%
{"report_to":"network-errors","max_age":604800,"success_fraction":0.001,"failure_fraction":1.0} 0.01%
{"report_to": "default", "max_age": 2592000}`); 0.01%
{"report_to":"default","max_age":864000,"include_subdomains":true} 0.01%
{"report_to":"nel-endpoint","max_age":0,"include_subdomains":true} 0.01%
{ "report_to": "wm_nel", "max_age": 86400, "failure_fraction": 0.05, "success_fraction": 0.0} 0.01%