NSURL Caching issues - objective-c

Question

I'm having an issue with a login API. First call works fine, but subsequent calls are cached. This is causing an issue since login/logout functionality is essentially broke.
I've tried many methods and I'm implementing AFNetworking library.
In AppDelegate.m:
NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0
diskCapacity:0
diskPath:nil];
[NSURLCache setSharedURLCache:sharedCache];
In my Networking class:
(AFHTTPRequestOperation *)createRequestOperationWithMethod:(NSString *) method andPath: (NSString *)path andParams:(NSDictionary *)params
{
GRAPIClient *httpClient = [GRAPIClient sharedClient];
[httpClient setParameterEncoding:AFFormURLParameterEncoding];
NSMutableURLRequest *request = [httpClient requestWithMethod:method
path:path
parameters:params];
[request setCachePolicy:NSURLRequestReloadIgnoringCacheData]
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[httpClient registerHTTPOperationClass:[AFHTTPRequestOperation class]];
return operation;
}
I even tried to overwrite the request being generated in AFHTTPClient
In AFHTTPClient.m:
[request setCachePolicy:NSURLRequestReloadIgnoringCacheData];
[request setTimeoutInterval:2.0];
My GRAPIClient implementation:
#interface GRAPIClient : AFHTTPClient
+ (GRAPIClient *)sharedClient;
+ (BOOL) isInternetReachable;
#end
#implementation GRAPIClient
+ (BOOL) isInternetReachable
{
return reachable;
}
+ (GRAPIClient *)sharedClient {
static GRAPIClient *_sharedClient = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
_sharedClient = [[GRAPIClient alloc] initWithBaseURL:[NSURL URLWithString:kAFAppDotNetAPIBaseURLString]];
});
[_sharedClient setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
if (status == AFNetworkReachabilityStatusReachableViaWWAN ||
status == AFNetworkReachabilityStatusReachableViaWiFi ) {
NSLog(#"Reachable on!");
reachable = YES;
}
else
{
NSLog(#"Reachable off!");
reachable = NO;
}
}];
return _sharedClient;
}
- (id)initWithBaseURL:(NSURL *)url {
self = [super initWithBaseURL:url];
if (!self) {
return nil;
}
[self registerHTTPOperationClass:[AFJSONRequestOperation class]];
// Accept HTTP Header; see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1
[self setDefaultHeader:#"Accept" value:#"application/json"];
return self;
}
#end
I've debugged responses from the server and tested with hard coding two NSURLRequests simultaneously to the server. One for User A and one for User B, then printed the response data for both users.
On first login, User A login returned User A credentials. User B returned User B credentials. On second login, User A returned User A credentials, User B returned User A credentials. I have no idea how to fully disable cacheing.

Answer 1

Try:
[operation setCacheResponseBlock:^NSCachedURLResponse*(NSURLConnection* connection, NSCachedURLResponse* cachedResponse) {
return nil;
}];
And:
[request setCachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData];

Answer 2

The issue for me as suggested by SixteenOtto was a session being sent from the server and AFNetworking automatically using the cookie. I hadn't considered this before since we're using a restless API based on auth tokens, so a cookie for the session makes no sense. However, inspecting the HTTP response headers with Charles allowed me to see this.
Adding
[request setHTTPShouldHandleCookies:NO];
To my operation generator solved the issue.