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docs(service-worker): mention that dataGroups only cache non-mutating requests #32142

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docs(service-worker): mention that dataGroups only cache non-mutating requests #32142

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5 changes: 3 additions & 2 deletions aio/content/guide/service-worker-config.md
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Expand Up @@ -137,8 +137,9 @@ export interface DataGroup {
Similar to `assetGroups`, every data group has a `name` which uniquely identifies it.

### `urls`
A list of URL patterns. URLs that match these patterns will be cached according to this data group's policy.<br>
_(Negative glob patterns are not supported and `?` will be matched literally; i.e. it will not match any character other than `?`.)_
A list of URL patterns. URLs that match these patterns are cached according to this data group's policy. Only non-mutating requests (GET and HEAD) are cached.
* Negative glob patterns are not supported.
* `?` is matched literally; that is, it matches *only* the character `?`.

### `version`
Occasionally APIs change formats in a way that is not backward-compatible. A new version of the app may not be compatible with the old API format and thus may not be compatible with existing cached resources from that API.
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