// 1. Register NSURLProtocol to intercept requests
[NSURLProtocol registerClass:[MSDKDnsHttpMessageTools class]];

// 2. Register scheme
Class cls = NSClassFromString(@"WKBrowsingContextController");
SEL sel = NSSelectorFromString(@"registerSchemeForCustomProtocol:");
if ([cls respondsToSelector:sel]) {
    // Requests via http and https, likewise via other schemes but must meet the URL Loading System
    [cls performSelector:sel withObject:@"http"];
    [cls performSelector:sel withObject:@"https"];
}

// 3. Use WKWebView.loadRequest
[self.wkWebView loadRequest:request];