[Bug 367531]

[Adam Dane]

Created attachment 619220
netwerk: Add offline mode to DNS service and STS.  Add RESOLVE_OFFLINE flag for nsHostResolver.

When the STS is offline, the socket thread detects that and calls
|Reset()|, which detaches the sockets.  If not shutting down, it only
detaches non-local sockets.

When the DNS service is offline, it adds a new RESOLVE_OFFLINE flag to
calls to |nsHostResolver::ResolveHost()|.  This flag restricts
resolution to literals and cached entries.

Should |nsHostResolver::ResolveHost()| still try to resolve when
RESOLVE_OFFLINE, but only return loopback records (to allow local
hostnames like "localhost")?

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https://bugs.launchpad.net/bugs/367531

Title:
  firefox should be smarter about offline access

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