HTTP response headers
HTTP headers are part of the HTTP protocol used to request web pages, request responses from API endpoints, and to send the response (e.g. from the web page or the API response). Some HTTP response headers are added by the WPVIP Platform and can be useful for troubleshooting.
HTTP headers are not visible when viewing web pages in a browser, nor when viewing the HTML source for a web page. To inspect request and response headers, use specific tools such as cURL or developer tools in a web browser.
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HTTP response headers added by VIP
A set of default HTTP response headers are added to every site that is hosted on the VIP Platform. These headers help VIP to monitor the platform and can be useful for troubleshooting the origin of a request.
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Retrieve HTTP response headers
cURL commands can be used in a terminal on a user’s local machine to retrieve all HTTP response headers for a request, or to retrieve a specific HTTP response header for a request.
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Add, edit, or remove HTTP response headers
HTTP response headers can be added, and some of a site’s HTTP response headers can be edited or removed.
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Stale responses
A stale response is a cached object that could be served by the page cache up to 12 hours outside of a resource’s set max-age while the page cache fetches an updated response from the origin to serve for future requests.
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CORS headers
A default CORS policy is returned by VIP’s edge servers for all files that are stored in the VIP File System (files within the path /wp-content/uploads).
Last updated: November 19, 2025