| title | description | services | author | manager | ms.service | ms.topic | ms.date | ms.author |
|---|---|---|---|---|---|---|---|---|
Debug HTTP headers for Azure CDN from Microsoft |
Debug cache request headers provide additional information about the cache policy applied to the requested asset. These headers are specific to Azure CDN from Microsoft. |
cdn |
duongau |
kumudd |
azure-cdn |
article |
03/20/2024 |
duau |
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.
| 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.