iPhone NSURL get last redirected url

问题:

i wonder how can you update your NSURL to the last url that a your url will redirect to
using NSURL or NSRequest

appreciate your help. thanks.

回答1:

zanque's solution works, but in order to avoid downloading "useless" data, I'd change the http method to HEAD :

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:orinigalURL cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:15.0];
[request setHTTPMethod:@"HEAD"];
NSURLResponse *response = nil;
[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
NSURL *finalURL = response.URL;

回答2:

i did it,

here is how

NSURL *originalUrl=[NSURL URLWithString:@"http://YourURL.com"];
NSData *data=nil;  
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:originalUrl cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:10];
NSURLResponse *response;
NSError *error;
data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSURL *LastURL=[response URL];
[request release];
[error release];

回答3:

You'll only be able to find this out after trying to connect using NSURLConnection. If you add a method to your NSURLConnection delegate, -connection:willSendRequest:redirectResponse:, you'll be notified before redirects happen. Just grab the URL from the passed request, and that's your answer.