| title | description | services | documentationcenter | author | manager | editor | ms.assetid | ms.service | ms.workload | ms.tgt_pltfrm | ms.topic | ms.date | ms.author |
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Debug HTTP headers for Azure CDN from Microsoft | Microsoft Docs |
Debug cache request headers provides additional information about the cache policy applied to the requested asset. These headers are specific to Azure CDN from Microsoft. |
cdn |
duongau |
danielgi |
azure-cdn |
media |
na |
article |
07/31/2019 |
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 is a cache miss, and the content is served from the Origin. |
| X-Cache: PRIVATE_NOSTORE | This header is returned when the request cannot 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 the request that was denied by Signed URL and Rules Set. |
For additional information on HTTP headers supported in Azure CDN, see Front Door to backend.