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Let candidate be the resource identified by the URL in question from the most appropriate application cache of those that match. If candidate is not marked as foreign, then the user agent must discard the failed load and instead continue along these steps using candidate as the resource. The user agent may indicate to the user that the original page load failed, and that the page used was a previously cached resource. 8. Resource handling: If the resource’s out-of-band metadata (e.g. HTTP status codes (e.g. Cryptographic protocol failures (e.g. Responses with HTTP Content-Disposition headers specifying the attachment disposition type must be handled as a download. HTTP 401 responses that do not include a challenge recognized by the user agent must be processed as if they had no challenge, e.g. User agents may show the entity body of an HTTP 401 response even when the response does include a recognized challenge, with the option to login being included in a non-modal fashion, to enable the information provided by the server to be used by the user before authenticating.

Application caches and cookies have similar implications with respect to privacy (e.g. Implementors are therefore encouraged to expose application caches in a manner related to HTTP cookies, allowing caches to be expunged together with cookies and other origin-specific data. For example, a user agent could have a «delete site-specific data» feature that clears all cookies, application caches, local storage, databases, etc, from an origin all at once. User agents should consider applying constraints on disk usage of application caches, and care should be taken to ensure that the restrictions cannot be easily worked around using subdomains. User agents should allow users to see how much space each domain is using, and may offer the user the ability to delete specific application caches. How quotas are presented to the user is not defined by this specification. User agents are encouraged to provide features such as allowing a user to indicate that certain sites are trusted to use more than the default quota, e.g.

The default action of these events must be, if the user agent shows caching progress, the display of some sort of user interface indicating to the user that the user agent failed to save the application for offline use. Empty cache group’s list of pending master entries. If cache group has an application cache whose completeness flag is incomplete, then discard that application cache. If appropriate, remove any user interface indicating that an update for this cache is in progress. Let the status of cache group be idle. If this was a cache attempt, discard cache group altogether. For each task in task list, queue that task as a post-load task. Abort the application cache download process. Attempts to fetch resources as part of the application cache download process may be done with cache-defeating semantics, to avoid problems with stale or inconsistent intermediary caches. User agents may invoke the application cache download process, in the background, for any application cache group, at any time (with no cache host).