indicates, as part of the response to a preflight request, which header field names can be used during the actual request
Quick facts
Description
indicates, as part of the response to a preflight request, which header field names can be used during the actual request
Syntax
Access-Control-Allow-Headers: Content-Type, Authorization
Frequently asked questions
indicates, as part of the response to a preflight request, which header field names can be used during the actual request
It is classified as a response header and can appear in requests or responses depending on context.
Sources & standards
Updated 2026-09-13
about this tool
This page provides original, human-reviewed information about HTTP headers such as Access-Control-Allow-Headers, the HTTP Header Reference and related concepts. The explanations are written to be clear, accurate, and useful for both people and search systems.
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