X-Cache-Miss-From
The HTTP X-Cache-Miss-From response header is an unofficial header identifying which cache node recorded a cache miss when serving a request.
Usage
When a CDN or reverse proxy fails to find a cached copy of a
resource, some systems emit X-Cache-Miss-From to record
which specific node or pod had to reach back to origin. The
value is typically a server or Kubernetes pod identifier such
as parking-7968547645-84pss or parking-7bf6ddfb95-nk5lt.
This header surfaces the physical or logical layer where the miss occurred. In multi-tier cache architectures, a miss at one layer triggers a fetch from the next layer or from origin. Knowing which node missed helps operators pinpoint cold cache nodes, identify uneven cache distribution across pods, and trace the path a cache miss took through the infrastructure.
The header complements X-Cache, which reports the miss status, by adding the identity of the node responsible. Where X-Cache-Hits counts how many times a cached resource was served, X-Cache-Miss-From records the opposite: the node with an empty cache.
Note
The "X-" naming convention for HTTP headers, "X" referring to "experimental", has been deprecated and needs to be transitioned to the formal naming convention for HTTP headers.
Values
The value is a server or pod name assigned by the hosting infrastructure. Kubernetes-based deployments commonly produce identifiers following patterns like:
parking-7968547645-84pss: a pod name with a replicaset hash and pod hash suffixparking-7bf6ddfb95-nk5lt: another pod in the same deployment
The format is deployment-specific and carries no standardized structure. The strings are meaningful to the infrastructure team and are intended for log correlation and debugging rather than client interpretation.
Example
A Kubernetes-hosted CDN edge returns X-Cache-Miss-From
alongside a MISS from X-Cache-Status.
The pod identifier tells the operator which replica had an
empty cache for this resource.
X-Cache: MISS
X-Cache-Miss-From: parking-7968547645-84pss
When multiple cache layers are active, the value pinpoints the layer triggering the origin fetch. The pod name below corresponds to a different replica than the one serving the response, indicating the miss occurred at an intermediate cache tier.
X-Cache: MISS
X-Cache-Miss-From: parking-7bf6ddfb95-nk5lt
Takeaway
The X-Cache-Miss-From header records the identity of the cache node failing to find a stored copy of the resource. A debugging aid for operators tracing cache misses across distributed or pod-based Caching infrastructure.