On 23 May '08, at 11:11 PM, Mike wrote:
Why does [ NSURLConnection canHandleRequest: ] return YES even if I turn off all my network connections? I thought this method was supposed to be used for preflighting connection requests?
No, it just tells you whether there's support for that URL scheme (http:, ftp:, etc.)
If you want to tell whether the host is reachable, you need to use the System Configuration API — look up the docs for SCNetworkCheckReachabilityByName. (I also just noticed CFHostGetReachability, which looks like a higher-level interface that might be easier to call.)
Even this just checks the system's network interfaces and routing tables to decide whether the kernel knows how to route a packet towards that address — it does _not_ actually try to contact the server, so it can't tell you if there's a broken gateway, or the server is down, or it's not listening on the port you want to connect to, etc.
—Jens
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