NSMutableURLRequest and NSURLConnectionDelegate

gistfile1.m

- (void)go {
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:@"http://httpbin.org/headers"]];
    [request setHTTPShouldHandleCookies:NO];
    [request setHTTPMethod:@"GET"];
    [request setValue:@"Test" forHTTPHeaderField:@"User-Agent"];
    [request setTimeoutInterval:10];
    
    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    if (connection) {
        NSLog(@"Connecting...");
    } else {
        NSLog(@"Error!");
    }
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    response = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    NSLog(@"%@", response);
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    NSLog(@"%@",[error localizedDescription]);
}