Debug HTTP header for Azure CDN from Microsoft
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.
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