NEL header

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The HTTP NEL response header is used to configure network request logging.

Header type	Response header

Syntax

http

NEL: { "report_to": "name_of_reporting_group", "max_age": 12345, "include_subdomains": false, "success_fraction": 0.0, "failure_fraction": 1.0 }

Specification
Network Error Logging # nel-response-header

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`NEL` Experimental	Chrome – Full support Chrome 71 (Release date: 2018-12-04) footnote Full support	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote Full support	Firefox – No support Firefox footnote No support	Opera – Full support Opera 58 (Release date: 2019-01-23) footnote Full support	Safari – No support Safari footnote No support	Chrome Android – Full support Chrome Android 71 (Release date: 2018-12-04) footnote Full support	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – Full support Opera Android 50 (Release date: 2019-02-18) footnote Full support	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – Full support Samsung Internet 10.2 (Release date: 2019-10-09) footnote Full support	WebView Android – Full support WebView Android 71 (Release date: 2018-12-04) footnote Full support	WebView on iOS – No support WebView on iOS footnote No support

Tip: you can click/tap on a cell for more information.