cacheError

Delivery Manager name: Cache HTTP Error Responses
Behavior version: The latest rule format supports the cacheError behavior v1.1.

With the caching behavior also enabled, this caches the origin's error responses to decrease server load. It applies for 10 seconds by default to the following HTTP codes: 204, 305, 404, 405, 501, 502, 503, 504, and 505.

This behavior no longer caches 400 error responses from the origin server. If you need to cache such errors, you can set up a custom variable. See Caching 400 responses for more information.

Note that the cacheError behavior works only with the caching behavior enabled.

Option Type Description Requires

Option	Type	Description
`enabled`	boolean	Activates the error-caching behavior.	{"displayType":"boolean","tag":"input","type":"checkbox"}
`ttl`	string (duration)	Overrides the default caching duration of `10s`. Note that if set to `0`, it is equivalent to `no-cache`, which forces revalidation and may cause a traffic spike. This can be counterproductive when, for example, the origin is producing an error code of `500`.	{"displayType":"string","tag":"input","type":"text"} {"if":{"attribute":"enabled","op":"eq","value":true}}
`preserveStale`	boolean	When enabled, the edge server preserves stale cached objects when the origin returns `500`, `502`, `503`, and `504` error codes. This avoids re-fetching and re-caching content after transient errors.	{"displayType":"boolean","tag":"input","type":"checkbox"} {"if":{"attribute":"enabled","op":"eq","value":true}}

enabled

boolean

Activates the error-caching behavior.

{"displayType":"boolean","tag":"input","type":"checkbox"}

ttl

string (duration)

Overrides the default caching duration of 10s. Note that if set to 0, it is equivalent to no-cache, which forces revalidation and may cause a traffic spike. This can be counterproductive when, for example, the origin is producing an error code of 500.

{"displayType":"string","tag":"input","type":"text"}

{"if":{"attribute":"enabled","op":"eq","value":true}}

preserveStale

boolean

When enabled, the edge server preserves stale cached objects when the origin returns 500, 502, 503, and 504 error codes. This avoids re-fetching and re-caching content after transient errors.

{"displayType":"boolean","tag":"input","type":"checkbox"}

{"if":{"attribute":"enabled","op":"eq","value":true}}