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Access-Control-Max-Age

indicates how long the results of a preflight request can be cached in a preflight result cache

响应头CORS

Quick facts

NameAccess-Control-Max-Age
Type响应头
SpecificationCORS

Description

indicates how long the results of a preflight request can be cached in a preflight result cache

Syntax

Access-Control-Max-Age: 600

CORS

Frequently asked questions

What does the Access-Control-Max-Age header do?

indicates how long the results of a preflight request can be cached in a preflight result cache

Is Access-Control-Max-Age a request or response header?

It is classified as a response header and can appear in requests or responses depending on context.

Sources & standards

Updated 2026-08-18