[Sparkle] SSL Certificate error alert when appcast server not reachable

[Paul Collins]

During a network outage, I noticed that the automatic at-launch  
update reported this error:

The SSL certificate for "http://(my appcast server).com" was  
rejected. <My App> does not currently support downloading with  
invalid or self-signed certificates."

The SUFeedURL is http, not https.

I happening to be running an https server (yes, self-signed) at the  
same address as the http server used for appcasts. Even when the  
https port is blocked, when the http port is unreachable, I see the  
error. Perhaps this certificate was cached on my Mac--if so this  
might be moot--as customers are unlikely to ever connect to https  
without being able to connect to http.

Is there anything I can/should do to make sure my customers never see  
this error? I guess I'm looking for a "never try https" preference.

(The https server is only used privately).

Aside from that, Sparkle is stupendous!

--Paul Collins

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