What is the Alt-Svc HTTP header and how is it used?

Answered on : 2024-01-24

Sources

Alt-Svc - HTTP - MDN Web Docs

developer.mozilla.org

HTTP Alternative Services 介绍| JerryQu 的小站

imququ.com

HTTP/3：HTTP Alternative Services 作为协商方式 - Sukka's Blog

blog.skk.moe

view 10 more

Answer

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The Alt-Svc HTTP header is used by a server to indicate that another network location, known as the "alternative service," can be treated as a substitute for the current service. This allows the server to redirect future requests to the alternative service. The Alt-Svc header is typically used in HTTP/1 and HTTP/2 protocols to specify alternate service addresses. It can be used to redirect requests from one host to another, or to redirect requests from one protocol version to another. The Alt-Svc header is not specifically designed for QUIC or HTTP/3, but it can be used in these protocols as well. [1] [2] [3]