NEL

HTTP response header

Header usage statistics

NEL response header information and usage statistics.

Websites using header NEL5,201,946
Percentage of websites that use NEL header5.15%
Total discovered header values358
Header uses directivesNo
Header values are unique or randomNo
Most popular in the country US

NEL Directives

NEL directives value information and usage statistics

DirectiveShareWebsites countUnique Values

Distribution by websites popularity

NEL detection in the top websites by popularity

Top 10k sites972 websites
Top 100k sites11,331 websites
Top 1m sites124,816 websites

Websites utilizing NEL

List of websites that use NEL header

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Geographical Distribution

Header usage distribution by websites across the globe.






Common header values

List of top common NEL header values

Header valueValue prevalence
{"success_fraction":0,"report_to":"cf-nel","max_age":604800}95.60%
{"success_fraction":0.01,"report_to":"cf-nel","max_age":604800}2.79%
{"report_to":"network-errors","max_age":2592000,"failure_fraction":0.1}1.21%
{ "report_to": "wm_nel", "max_age": 86400, "failure_fraction": 0.05, "success_fraction": 0.0}0.07%
{"report_to":"default","max_age":31536000,"include_subdomains":true}0.06%
{"report_to":"default","max_age":31557600,"include_subdomains":true,"success_fraction":0.005"}0.05%
{"report_to":"default","max_age":31557600,"include_subdomains":true,"success_fraction":0.005}0.03%
{"success_fraction":0,"report_to":"nel","max_age":3600}0.03%
{"report_to":"default","max_age":2592000,"include_subdomains":true}0.03%
{"report_to":"default","max_age":2592000,"include_subdomains":true,"failure_fraction":1.0}0.02%
{"report_to":"network-errors","max_age":86400,"success_fraction":0.001,"failure_fraction":1.0}0.01%
{"report_to":"network-errors","max_age":86400,"success_fraction":0.2,"failure_fraction":1.0}0.01%
{"report_to":"default","max_age":31557600,"include_subdomains":true,"success_fraction":0.2}0.01%
{"report_to":"network-errors","max_age":7200,"success_fraction":0.001,"failure_fraction":1.0}0.01%
{"report_to":"default","max_age":604800}0.01%
{"max_age":604800,"report_to":"default"}0.01%
{"report_to": "default", "max_age": 86400, "failure_fraction": 0.1, "success_fraction": 0.0}0.00%
{"report_to": "mediafirenel", "max_age": 86400, "include_subdomains": true, "failure_fraction": 0.01}0.00%
{"report_to": "gumlet-nel", "max_age": 604800, "success_fraction": 0.01, "response_headers":["content-length"] }0.00%
{'report_to':'default','max_age':31536000,'include_subdomains':true}0.00%