小编san*_*dip的帖子

func webView(webView: WKWebView!, decidePolicyForNavigationAction navigationAction: WKNavigationAction!, decisionHandler: ((WKNavigationActionPolicy) -> Void)!) {
     var request = NSMutableURLRequest(URL: navigationAction.request.URL)
     request.setValue("value", forHTTPHeaderField: "key")
     decisionHandler(.Allow)
}

在上面的代码中,我想为请求添加一个标头.我试过,navigationAction.request.setValue("IOS", forKey: "DEVICE_APP")但它不起作用.

请以任何方式帮助我.