Note
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Important
Azure CDN Standard from Microsoft (classic) retires on September 30, 2027. Because the service is retiring, it no longer supports profile creation, new domain onboarding, or managed certificates. To avoid service disruption, migrate to Azure Front Door Standard or Premium. For more information, see Azure CDN Standard from Microsoft (classic) retirement.
The debug response header, X-Cache, provides details as to what layer of the CDN stack the content was served from. This header is specific to Azure CDN from Microsoft.
Response header format
| Header | Description |
|---|---|
| X-Cache: TCP_HIT | This header is returned when the content is served from the CDN edge cache. |
| X-Cache: TCP_REMOTE_HIT | This header is returned when the content is served from the CDN regional cache (Origin shield layer) |
| X-Cache: TCP_MISS | This header is returned when there's a cache miss, and the content is served from the Origin. |
| X-Cache: PRIVATE_NOSTORE | This header is returned when the request can't be cached as Cache-Control response header is set to either private or no-store. |
| X-Cache: CONFIG_NOCACHE | This header is returned when the request is configured not to cache in the CDN profile. |
| X-Cache: N/A | This header is returned when a request gets denied by Signed URL and Rules Set. |
For more information on HTTP headers supported in Azure CDN, see Azure Front Door to backend.