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

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Fixes #28988

PR Close #32142
This commit is contained in:
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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5
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. Similar to `assetGroups`, every data group has a `name` which uniquely identifies it.
### `urls` ### `urls`
A list of URL patterns. URLs that match these patterns will be cached according to this data group's policy.<br> 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 and `?` will be matched literally; i.e. it will not match any character other than `?`.)_ * Negative glob patterns are not supported.
* `?` is matched literally; that is, it matches *only* the character `?`.
### `version` ### `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. 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.