Cache-Control:no-cache is cached but immediately invalidated, and then go to cdn to compare etag. If the etag does not expire, it will return 304to use the local cache, and if it expires, it will return 202to use the newly launched content.
current scenario: how should I use local cache instead of reporting network errors when I go to cdn to compare etag, but the network is not working? Is there such a configuration at the front end? How should it be configured?