WKWebView Cookies

I'm using the below mentioned approach to set cookies in a WKWebview: Can I set the cookies to be used by a WKWebView?

But the cookies that I have set are being duplicated in the AJAX calls. I mean they are being repeated twice.

Here is the code snippet that I used:

NSString *strURL = DASHBOARDURL;    
NSURL *url = [NSURL URLWithString:strURL];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:url];

NSMutableString *script = [[NSMutableString alloc] init];
NSMutableString *cookieString = [[NSMutableString alloc] init];

for (NSHTTPCookie *cookie in [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]) {
    [script appendString:[NSString stringWithFormat:@"document.cookie='%@';",cookie.getCookieString]];
    [cookieString appendString:[NSString stringWithFormat:@"%@;", cookie.getCookieString]];
}
[request setValue:cookieString forHTTPHeaderField:@"Cookie"];

//cookies for further AJAX calls
WKUserContentController *userContentController = [[WKUserContentController alloc] init];
WKUserScript *cookieInScript = [[WKUserScript alloc] initWithSource:script
                                                      injectionTime:WKUserScriptInjectionTimeAtDocumentStart
                                                   forMainFrameOnly:YES];
[userContentController addUserScript:cookieInScript];

WKWebViewConfiguration *webViewConfig = [[WKWebViewConfiguration alloc] init];
webViewConfig.userContentController = userContentController;

CGRect viewRect = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height);

wkWebview = [[WKWebView alloc] initWithFrame:viewRect configuration:webViewConfig];
wkWebview.navigationDelegate = self;
[wkWebview loadRequest:request];
[self.view addSubview:wkWebview];

getCookieString is a method that returns cookie values as an NSString

1. Will the WKWebView set the cookies back to NSHTTPCookieStorage at runtime(During AJAX calls)
2. Can i control AJAX calls cookies with any delegate methods?