# CORS Header The **CORS Header** feature for Dynamic Content Acceleration operates the same way as in Static Content Delivery.\ It allows CDN edge servers to set or override the `access-control-allow-origin` header for HTML responses when you want to explicitly control which origins may access your resources. By default, the CDN forwards CORS headers returned by your origin; enabling this feature instructs the CDN to generate or override the header instead, using either a wildcard or a defined allow list. For configuration details, allowed domain behavior, and examples, refer to the main documentation:\ **Learn more in the** [**CORS Header documentation**](/products/performance-cdn/static-content-delivery/advanced-configuration/headers/cors-header.md)**.** --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://clients.medianova.com/products/performance-cdn/dynamic-content-acceleration/advanced-configuration/headers/cors-header.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.