How to make sure NSUrlSession does not fetch cached pages?

Question

I'm using NSUrlSession to download the contents of an HTML page (so I can parse it, against my will). My problem is that iOS seems to be caching the page with my app, so that even if I update this page on the server, my app keeps seeing the old version (this persists until I delete and reinstall the app).

How can I get NSUrlSession to always download a fresh copy?

Edit: not that complicated, just had to change this:

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]

to this:

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url 
    cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData 
    timeoutInterval:0]; 

Answer 1

Try to set your NSURLSessionConfiguration's requestCachePolicy to NSURLRequestReloadIgnoringLocalCacheData.

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
configuration.requestCachePolicy = NSURLRequestReloadIgnoringLocalCacheData;
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration];