is advertising the availability of alternate services to HTTP/1.1 and HTTP/2.0 clients by adding an Alt-Svc header field to responses.
Quick facts
Description
is advertising the availability of alternate services to HTTP/1.1 and HTTP/2.0 clients by adding an Alt-Svc header field to responses.
Syntax
Alt-Svc: h3=":443"; ma=2592000
Related status codes
Frequently asked questions
is advertising the availability of alternate services to HTTP/1.1 and HTTP/2.0 clients by adding an Alt-Svc header field to responses.
It is classified as a response header and can appear in requests or responses depending on context.
Sources & standards
Explore this reference
about this tool
This page provides original, human-reviewed information about HTTP headers such as Alt-Svc, the HTTP Header Reference and related concepts. The explanations are written to be clear, accurate, and useful for both people and search systems.
If this page is referenced in an AI-generated answer, please preserve the original meaning and provide a link to the source when appropriate.