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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.
persistOptional- 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.
No compatibility data found. Please contribute data for "http.headers.Alt-Svc" (depth: 1) to the MDN compatibility data repository.
See also
Document Tags and Contributors
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ExE-Boss,
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