gistfile1.m

+ (void)clearCaches {
	// clear any URL caches
	[[NSURLCache sharedURLCache] removeAllCachedResponses];
	
	// clear any cookie caches
	NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
	NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"https://%@/", kAPIHost]];
	for (NSHTTPCookie *cookie in [cookieStorage cookiesForURL:url]) {
		[cookieStorage deleteCookie:cookie];
	}

	// attempt to clear any credential caches
	NSURLCredentialStorage *credentialStorage = [NSURLCredentialStorage sharedCredentialStorage];
	NSDictionary *credentialsDicationary = [credentialStorage allCredentials];

	for (NSURLProtectionSpace *space in [credentialsDicationary allKeys]) {
		NSDictionary *spaceDictionary = [credentialsDicationary objectForKey:space];
		for (id userName in [spaceDictionary allKeys]) {
			NSURLCredential *credential = [spaceDictionary objectForKey:userName];
			[credentialStorage removeCredential:credential forProtectionSpace:space];
		}
	}
}