Accept-Ranges header

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

See full compatibility

The HTTP Accept-Ranges response header is used by the server to advertise its support for range requests, allowing clients to request part or several parts of a resource. The value of this header indicates the unit that can be used to define a range.

For example, a response with an Accept-Ranges header indicates that the server is capable of resuming an interrupted download instead of a client restarting the transfer in full.

Header type	Response header

Syntax

http

Accept-Ranges: <range-unit>
Accept-Ranges: none

Directives

<range-unit>: The range unit that the server supports, although bytes is the only range unit formally defined by RFC 7233. Range units are registered in the HTTP Range Unit Registry.
none: No range unit is supported. This is equivalent to omitting the header and is, therefore, rarely used. This value was used in legacy browsers to disable or remove the pause buttons in the download manager if servers had no support for range requests.

Examples

http

Accept-Ranges: bytes

Specifications

Specification
HTTP Semantics # field.accept-ranges

Browser compatibility

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`Accept-Ranges`	Chrome – Full support Chrome 1 (Release date: 2008-12-11) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 1 (Release date: 2004-11-09) footnote Full support	Opera – Full support Opera 15 (Release date: 2013-07-02) footnote Full support	Safari – Full support Safari 1 (Release date: 2003-06-23) footnote Full support	Chrome Android – Full support Chrome Android 18 (Release date: 2012-06-27) footnote Full support	Firefox for Android – Full support Firefox for Android 4 (Release date: 2011-03-29) footnote Full support	Opera Android – Full support Opera Android 14 (Release date: 2013-05-21) footnote Full support	Safari on iOS – Full support Safari on iOS 1 (Release date: 2007-06-29) footnote Full support	Samsung Internet – Full support Samsung Internet 1 (Release date: 2013-04-27) footnote Full support	WebView Android – Full support WebView Android 4.4 (Release date: 2013-12-09) footnote Full support	WebView on iOS – Full support WebView on iOS 1 (Release date: 2007-06-29) footnote Full support

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Full support: Full support