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docs(service-worker): add info about no network request for performance strategy (#29288) 

PR Close #29288
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Jun 2019-03-13 14:13:15 -07:00 committed by Jason Aden
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aio/content/guide/service-worker-config.md
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@ -179,7 +179,7 @@ For example, the string `5s30u` will translate to five seconds and 30 millisecon
The Angular service worker can use either of two caching strategies for data resources. The Angular service worker can use either of two caching strategies for data resources.
* `performance`, the default, optimizes for responses that are as fast as possible. If a resource exists in the cache, the cached version is used. This allows for some staleness, depending on the `maxAge`, in exchange for better performance. This is suitable for resources that don't change often; for example, user avatar images. * `performance`, the default, optimizes for responses that are as fast as possible. If a resource exists in the cache, the cached version is used, and no network request is made. This allows for some staleness, depending on the `maxAge`, in exchange for better performance. This is suitable for resources that don't change often; for example, user avatar images.
* `freshness` optimizes for currency of data, preferentially fetching requested data from the network. Only if the network times out, according to `timeout`, does the request fall back to the cache. This is useful for resources that change frequently; for example, account balances. * `freshness` optimizes for currency of data, preferentially fetching requested data from the network. Only if the network times out, according to `timeout`, does the request fall back to the cache. This is useful for resources that change frequently; for example, account balances.