Finding whether a URL is valid and does it exists? [duplicate]

Answer 1

You can see if a URL is valid or not by doing the following:

NSString *urlString = ... // some URL to check
NSURL *url = [NSURL URLWithString:urlString];
if (url) {
    // valid URL (meaning it is the proper format)
}

To see if the URL exists in the Internet, you need to perform a HEAD request and check the result. This is more efficient than loading all of the data for the URL.

NSMutableURLRequest request = [NSMutableURLRequest requestWithURL:inURL];
[request setHTTPMethod:@"HEAD"];

NSURLConnection connection = [NSURLConnection connectionWithRequest:request delegate:self];


- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    if ([(NSHTTPURLResponse *)response statusCode] == 200) {
        // url exists
    }
}