Draft
This page is not complete.
The Alt-Svc
header is used to list alternate ways to reach this website.
Syntax
Alt-Svc: clear Alt-Svc: <service-list>; ma=<max-age> Alt-Svc: <service-list>; ma=<max-age>; persist=1
<service-list>
- Comma separated list of service definitions in the format of
<service-name>="<host-name>:<port-number>"
, where<service-name>
is a valid ALPN identifier. <max-age>
Optional- The time in seconds for which the alternative service is considered valid for establishing new connections. Defaults to 24 hours.
persist
Optional- Optional parameter specifying that the alternative service can be remembered between sessions and network changes.
Specifications
Specification | Status | Comment |
---|---|---|
RFC 7838 | IETF RFC | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Alt-Svc | Chrome Full support Yes | Edge ? | Firefox
Full support
38
| IE ? | Opera Full support Yes | Safari ? | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android
Full support
38
| Opera Android Full support Yes | Safari iOS ? | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown
- See implementation notes.
- See implementation notes.
- User must explicitly enable this feature.
- User must explicitly enable this feature.