我正试图创建共享扩展，需要网址和html并将其发送到服务器。代码工作2次，比停止。我真的迷路了。请帮助：

override func didSelectPost() {
        let url = self.extensionContext!.inputItems[0] as! NSExtensionItem
        let itemProvider = url.attachments![0] as NSItemProvider
        
        if itemProvider.hasItemConformingToTypeIdentifier("public.url") {
            itemProvider.loadItem(forTypeIdentifier: "public.url", options: nil) { (url, error) in
                if let error = error {
                    // Handle error
                    return
                }
                
                guard let shareURL = url as? URL else {
                    return
                }
                
                // Get the HTML
                guard let htmlString = try? String(contentsOf: shareURL) else {
                    return
                }
                
                let shareData = ShareData(url: shareURL.absoluteString, html: htmlString)
                guard let jsonData = try? JSONEncoder().encode(shareData) else {
                    return
                }
                
                // Do  sending it to a server
                let token = UserDefaults(suiteName: "group.com.readout.app")?.string(forKey: "FirebaseAccessToken")
                            let url = URL(string: "http://blabla.com/api/article")!
                            var request = URLRequest(url: url)
                            request.httpMethod = "POST"
                            request.setValue("application/json", forHTTPHeaderField: "Content-Type")
                            request.setValue("Bearer \(token ?? "")", forHTTPHeaderField: "Authorization")
                            request.httpBody = jsonData
                            
                            let task = URLSession.shared.dataTask(with: request) { data, response, error in
                                if let error = error {
                                    // Handle error
                                    return
                                }
                                
                                guard let response = response as? HTTPURLResponse else {
                                    return
                                }
                                
                                if response.statusCode == 200 {
                                    // Successfully sent data
                                } else {
                                    // Handle non-200 response
                                }
                            }
                            task.resume()
                        }
                    }

                self.extensionContext!.completeRequest(returningItems: [], completionHandler: nil)
    }

我检查了我从主应用程序收到的令牌。而且很奇怪，扩展程序随机地用完全相同的代码工作了2次。但是现在，我无法重现成功的案例。我是swift的新手，对这个问题了解甚少：-）感谢三一的帮助。谢谢