Re: NSURLConnection canHandleRequest: succeeds even with no network
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 smime.p7s Description: S/MIME cryptographic signature ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
Re: NSURLConnection canHandleRequest: succeeds even with no network
On Sat, May 24, 2008 at 2:11 AM, Mike <[EMAIL PROTECTED]> 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? >From what I gather, the "preflight" referred to in the docs is just a check to see if a protocol class is registered to handle the scheme (http:, file:, etc.). That is, it tells you if the proper machinery is in place to *attempt* the connection, not whether the attempt will succeed or not. It allows you to distinguish between "I don't grok gopher" and actual network-layer errors. sherm-- -- Cocoa programming in Perl: http://camelbones.sourceforge.net ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
NSURLConnection canHandleRequest: succeeds even with no network
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? Mike ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
