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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.

Header type Response header
Forbidden header name no

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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support YesEdge Full support YesFirefox Full support YesIE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes

Legend

Full support  
Full support

See also

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