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

Fixes #28988

PR Close #32142
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Judy Bogart 2019-08-14 11:57:50 -07:00 committed by Andrew Kushnir
parent 172bb76964
commit e85ec23037
1 changed files with 3 additions and 2 deletions
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aio/content/guide/service-worker-config.md
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@ -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.