Question

it’s possible to let my iPhone send automatically the UDID in all http request header?

Answer 1

You can create your own UUID that you can add to your header if you want. Save the UUID in preferences.

Maybe do this in - (BOOL)application:didFinishLaunchingWithOptions:

if (![[NSUserDefaults standardUserDefaults] stringForKey:@"deviceID"]) {
    CFUUIDRef uuid = CFUUIDCreate(NULL);
    NSString *uuidString = (__bridge_transfer NSString *) CFUUIDCreateString(NULL, uuid);
    [[NSUserDefaults standardUserDefaults] setValue:uuidString forKey:@"deviceID"];
    [[NSUserDefaults standardUserDefaults] synchronize];
    CFRelease(uuid);
}

You can then add the header to a NSMutableURLRequest

NSMutableURLRequest* request = [[NSMutableURLRequest alloc] initWithURL:url];

[request setValue:[[NSUserDefaults standardUserDefaults] stringForKey:@"deviceID"]
 forHTTPHeaderField:@"Device-ID"];