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/HTTP

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: bytes
Accept-Ranges: none

Directives

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.
bytes

The unit for ranges are bytes.

Examples

Accept-Ranges: bytes

Specifications

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

Browser compatibility

Feature Chrome Firefox Edge Internet Explorer Opera Safari
Basic Support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)
Feature Android Chrome for Android Edge mobile Firefox for Android IE mobile Opera Android iOS Safari
Basic Support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

See also

© 2005–2017 Mozilla Developer Network 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