NEL

HTTP response header

Header usage statistics

NEL response header information and usage statistics.

Websites using header NEL 723,120
Percentage of websites that use NEL header 6.21%
Total discovered header values 154
Header uses directives No
Header values are unique or random No
Most popular in the country United States of America

Distribution by websites popularity

NEL detection in the top websites by popularity

Top 10k sites 1,426 websites
Top 100k sites 10,617 websites
Top 1m sites 94,806 websites

Websites utilizing NEL

List of websites that use NEL header

Domain Country Rank Contacts
en.wikipedia.org United States of America 16
cdnjs.cloudflare.com United States of America 33
upload.wikimedia.org United States of America 99
bbc.co.uk United States of America 108
www.bbc.co.uk United Kingdom 108
bbc.com United States of America 109
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":"cf-nel","max_age":604800} 84.47%
{"report_to":"network-errors","max_age":2592000,"success_fraction":0.0001} 14.40%
{ "report_to": "wm_nel", "max_age": 86400, "failure_fraction": 0.05, "success_fraction": 0.0} 0.51%
{"report_to": "network-errors", "max_age": 600, "success_fraction": 0.001, "failure_fraction": 0.01} 0.20%
{"report_to":"network-errors","max_age":2592000,"failure_fraction":0.01,"success_fraction":0.0001} 0.19%
{"report_to": "default", "max_age": 86400, "failure_fraction": 0.1, "success_fraction": 0.0} 0.06%
{"report_to":"default","max_age":31536000,"include_subdomains":true} 0.05%
{"report_to":"default","max_age":2592000,"include_subdomains":true} 0.02%
{"report_to":"NelOfficeUpload1","max_age":86400,"include_subdomains":true,"failure_fraction":1.0,"success_fraction":0.01} 0.01%
{"report_to":"default","max_age":2592000,"include_subdomains":true,"failure_fraction":1.0} 0.01%
{"report_to":"network-errors","max_age":86400,"success_fraction":0.001,"failure_fraction":1.0} 0.01%
{"report_to":"network-errors","max_age":2592000,"success_fraction":0,"failure_fraction":1.0, "include_subdomains": true} 0.01%
{"report_to":"network-errors","max_age":1296000,"success_fraction":0.00066,"failure_fraction":1,"include_subdomains":true} 0.01%
{"report_to":"default","max_age": 604800,"include_subdomains":true,"failure_fraction":0.01} 0.01%
{"report_to": "network-errors", "max_age": 86400, "success_fraction": 0.001, "failure_fraction": 0.1} 0.00%
{'report_to':'default','max_age':31536000,'include_subdomains':true} 0.00%
{"include_subdomains": false, "max_age": 30, "report_to": "nel-endpoint"} 0.00%
{"report_to":"default","max_age":31536000,"include_subdomains":true,"failure_fraction":1.0} 0.00%
{"report_to":"network-errors","max_age":604800,"success_fraction":0.001,"failure_fraction":1.0} 0.00%
{"report_to":"default","max_age":2592000,"include_subdomains":true,"failure_fraction":0.05} 0.00%