NSURLSession didReceiveChallenge only once

Question

I am using NSURLSession dataTaskWithRequest:completionHandler:to execute some requests on my server. I use a self-signed certificate, so when the calling delegate URLSession:didReceiveChallenge:completionHandler:is called, I can perform my internal checks to make sure everything is in order.

All of this works great on the first request I submit. After the completion handler is called with NSURLSessionAuthChallengeUseCredential, then the following requests never call URLSession:didReceiveChallenge:completionHandler:.

For reasons that I will not enter this post, I would really like to be URLSession:didReceiveChallenge:completionHandler:called every time so that I can perform my own check. I assume that NSURLSession somehow caches the certificate and stores it in some list of "valid certificates", so it does not perform this check every time. I want to clear this cache in order to do my own check every time. If I restart the application, it URLSession:didReceiveChallenge:completionHandler:is called again.

I tried to set credential storage to zero without success:

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
configuration.URLCredentialStorage = nil;
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];
[[session dataTaskWithRequest:request
            completionHandler:^(NSData *data,
                                NSURLResponse *response,
                                NSError *error) {

                ...

            }] resume];

Any ideas how to do this?

Thank!

Answer 1

, , . , ssl- nginx.