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Accept-Ranges

The Accept-Ranges response HTTP header is a marker used by the server to advertise its support of partial requests. The value of this field indicates the unit that can be used to define a range.

In presence of an Accept-Ranges header, the browser may try to resume an interrupted download, rather than to start it from the start again.

Syntax

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

Directives

<range-unit>
Defines the range unit the server supports. Though bytes is the only range unit formally defined by RFC 7233, additional range units may be registered in the HTTP Range Unit Registry.
none
No range unit is supported, this makes the header equivalent of its own absence and is therefore rarely used, though some browsers, like IE9, it is used to disable or remove the pause buttons in the download manager.

Examples

Accept-Ranges: bytes

Specifications

Specification Title
RFC 7233, section 2.3: Accept-Ranges Hypertext Transfer Protocol (HTTP/1.1): Range Requests

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Accept-Ranges Yes 12 Yes Yes Yes Yes
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
Accept-Ranges Yes Yes Yes Yes Yes Yes

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Ranges