How can i add Authorization header to a wkwebview. I checked https://developer.apple.com/documentation/foundation/nsurlrequest#1776617 which says Authorization header is a reserved http header and shouldn’t be set. I want to set it when requesting a url in wkwebview for authentication purpose?

Hi, in our app we have a WKWebView with complex web content that is loaded with cachePolicy: .reloadIgnoringLocalCacheData. If the app is in the background for several hours and returns in the foreground we noticed that the system reloads the webpage, but it does so with a cachePoliy returnCacheDataElseLoad. This could break the app if older cache content is present. To reproduce start an app in the simulator (tested with iOS 17.2), put it in the background and via activity monitor stop the processes com.apple.Webkit.WebContent com.apple.Webkit.networking After foreground the reload will happen. Two questions: why is this reload happening after some hours in the background? We haven't seen any crash reports related to this. It mostly happens on one of our test devices (iphone13 with iOS17.2.1). why is the webview reloading with a modified cachePolicy (returnCacheDataElseLoad)? Our temporary fix is to detect this case in "webView:decidePolicyFor navigationAction decisionHandler", cancel the request and reload with modified cachePolicy. Any ideas? Thanks, Heiko Sample code: class ViewController: UIViewController, WKNavigationDelegate, WKUIDelegate { var webView: WKWebView! override func viewDidLoad() { super.viewDidLoad() let config = WKWebViewConfiguration() webView = WKWebView(frame: .zero, configuration: config) webView.uiDelegate = self webView.navigationDelegate = self view.addSubview(webView) let myRequest = URLRequest(url: URL(string: "https://www.apple.com")!, cachePolicy: .reloadIgnoringLocalCacheData) print("request \(myRequest)") webView.load(myRequest) } func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) { print("start loading \(String(describing: navigationAction.request.url)), cache:\(navigationAction.request.cachePolicy)") decisionHandler(.allow) } override func viewDidLayoutSubviews() { super.viewDidLayoutSubviews() let fullscreen = CGRect.init(x: 0, y: 0, width: view.frame.size.width, height: view.frame.size.height) webView.frame = fullscreen } }

Adding Stack Trace for your reference: thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BREAKPOINT (code=1, subcode=0x1a6efe5b8) frame #0: 0x00000001a6efe5b8 WebCoreWebCore::BaseAudioSharedUnit::BaseAudioSharedUnit() + 668 frame #1: 0x00000001a6efe044 WebCoreWebCore::CoreAudioSharedUnit::singleton() + 80 frame #2: 0x00000001a9521fe4 WebCoreWebCore::CoreAudioCaptureSource::create(WebCore::CaptureDevice const&, WebCore::MediaDeviceHashSalts&&, WebCore::MediaConstraints const*, std::__1::optional<WTF::ObjectIdentifierGeneric<WebCore::PageIdentifierType, WTF::ObjectIdentifierMainThreadAccessTraits<unsigned long long>, unsigned long long>>) + 360 frame #3: 0x00000001a94f180c WebCoreWebCore::RealtimeMediaSourceCenter::getUserMediaDevices(WebCore::MediaStreamRequest const&, WebCore::MediaDeviceHashSalts&&, WTF::Vector<WebCore::RealtimeMediaSourceCenter::DeviceInfo, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&, WTF::Vector<WebCore::RealtimeMediaSourceCenter::DeviceInfo, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&, WebCore::MediaConstraintType&) + 356 frame #4: 0x00000001a94f22cc WebCoreWebCore::RealtimeMediaSourceCenter::validateRequestConstraintsAfterEnumeration(WTF::Function<void (WTF::Vector<WebCore::CaptureDevice, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&&, WTF::Vector<WebCore::CaptureDevice, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&&)>&&, WTF::Function<void (WebCore::MediaConstraintType)>&&, WebCore::MediaStreamRequest const&, WebCore::MediaDeviceHashSalts&&) + 356 frame #5: 0x00000001a94fb394 WebCoreWTF::Detail::CallableWrapper<WebCore::RealtimeMediaSourceCenter::enumerateDevices(bool, bool, bool, bool, WTF::CompletionHandler<void ()>&&)::$_0, void>::~CallableWrapper() + 164 frame #6: 0x00000001a814bbe8 WebCoreWTF::Detail::CallableWrapper<WebCore::AVCaptureDeviceManager::refreshCaptureDevicesInternal(WTF::CompletionHandler<void ()>&&, WebCore::AVCaptureDeviceManager::ShouldSetUserPreferredCamera)::$_0::operator()()::'lambda'(), void>::call() + 520 frame #7: 0x00000001ab7f1aac JavaScriptCoreWTF::RunLoop::performWork() + 524 frame #8: 0x00000001ab7f1880 JavaScriptCoreWTF::RunLoop::performWork(void*) + 36 frame #9: 0x00000001935e7d0c CoreFoundationCFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 28 frame #10: 0x00000001935e7ca0 CoreFoundation__CFRunLoopDoSource0 + 172 frame #11: 0x00000001935e6a24 CoreFoundation__CFRunLoopDoSources0 + 232 frame #12: 0x00000001935e5c64 CoreFoundation__CFRunLoopRun + 840 frame #13: 0x000000019360a730 CoreFoundationCFRunLoopRunSpecific + 572 frame #14: 0x00000001e0fb5190 GraphicsServicesGSEventRunModal + 168 frame #15: 0x0000000196239f34 UIKitCore-[UIApplication _run] + 816 frame #16: 0x0000000196238164 UIKitCore`UIApplicationMain + 336 frame #17: 0x000000010811bec4 AppName.debug.dylibmain at AppDelegate.swift:25:13 frame #18: 0x00000001bae06a58 dyldstart + 5964

Hi! My SwiftUI app is a rather complex browser app. Starting with iOS 18, the app crashes due to repeted reloads of the WkWebView. I’ve tracked the issue as far as I can, but I still haven’t found the root cause. My app is structured like this: MainView holds a cuple of subviews. It also holds a @StateObject called viewModel that holds a lot of @Published vars. The viewModel is passed as a enivormentObject. Example from ViewModel: @MainActor class ViewModel: NSObject, ObservableObject { @Published public var isLoading: Bool = false @Published public var loadProgress: Double? = 0 public func setIsLoading(_ value: Bool) async { self.isLoading = value } public func setLoadProgress(_ value: Double?) async { self.loadProgress = value } } WebView is a subview of MainView, which holds a navigation bar, and a UIViewRepresentable, which is a WkWebView. The WkWebView pushes some states to the ViewModel as the underlying values of the WkWebView changes, i.e. estimaedProgress, and isLoading. This is done via KVO and works like this: estimatedProgressObservation = self.parent.webView.observe(\.estimatedProgress) { webView, progress in Task { await parent.viewModel.setLoadProgress(webView.estimatedProgress) } } isLoadingObservation = self.parent.webView.observe(\.isLoading) { webView, value in Task { await parent.viewModel.setIsLoading(webView.isLoading) } } By using a timer in WkWebViews Coordinator, i trigger a load after a configurable amount of time :
 func loadUrl(url: URL) { DispatchQueue.main.async { console.info("Load URL: ...", sensitive: "Load URL: \(url.absoluteString)") let policy: NSURLRequest.CachePolicy if self.parent.settings.noCache { policy = .reloadIgnoringLocalAndRemoteCacheData } else { policy = .useProtocolCachePolicy } let request = URLRequest(url: url, cachePolicy: policy) self.parent.webView.load(request) } } Running the app with the automatic reload enabled freezes the app after a couple of hours. It also seems to freeze Safari on the device. The device needs to be rebooted. If I inspect the device's running processes, hundreds of ”com.apple.webkit. web content " processes are running. Removing await parent.viewModel.setLoadProgress(webView.estimatedProgress) and await parent.viewModel.setIsLoading(webView.isLoading) fixes the issue, but it is necessary for other app functions. Therefore, is suspect that the viewModel somehow causes the bug. The issue arises after a couple of loads 5-10. The debugger shows a message when the processes start to pile up. I suspect its related. Failed to terminate process: Error Domain=com.apple.extensionKit.errorDomain Code=18 "(null)" UserInfo={NSUnderlyingError=0x12d0e7f60 {Error Domain=RBSServiceErrorDomain Code=1 "Client not entitled" UserInfo={RBSEntitlement=com.apple.runningboard.terminateprocess, NSLocalizedFailureReason=Client not entitled, RBSPermanent=true}}} How can I find out what causes the suspected memory leak? Instruments gives me nothing of value. The memory leak wasn't present in iOS 17. Is this a bug in iOS 18, or was something intentionally changed?

iOS 18 emulator wkwebview loading pdf display blank

Does webkit have a way to display a smart banner for a home screen web app similar to how a smart banner can be displayed for native apps? I recently noticed (10/23) that Twitter showed a smart banner encouraging Home Screen web app on my Mac running Sonoma. How is this done?

Who can help me, I am running into a WebKit crash on ios 17 and I cannot reproduce it in the debug environment. Crashes happen in these iOS version：17.6.1, 17.5.1, 17.7.5, 17.4, 17.7, 17.4.1, 17.7.3, 17.6 WebKit IPC::Connection::cancelReply<Messages::WebPage::PerformDragControllerAction, WebKit::WebPageProxy::performDragControllerAction(WebKit::DragControllerAction, WebCore::DragData&, std::__1::optional<WebCore::ProcessQualified<WTF::ObjectIdentifierGeneric<WebCore::FrameIdentifierType, WTF::ObjectIdentifierMainThreadAccessTraits> > > const&)::$_26>(WebKit::WebPageProxy::performDragControllerAction(WebKit::DragControllerAction, WebCore::DragData&, std::__1::optional<WebCore::ProcessQualified<WTF::ObjectIdentifierGeneric<WebCore::FrameIdentifierType, WTF::ObjectIdentifierMainThreadAccessTraits> > > const&)::$_26&&) (in WebKit) WebKit WTF::Detail::CallableWrapper<WebKit::AuxiliaryProcessProxy::sendMessage(WTF::UniqueRef<IPC::Encoder>&&, WTF::OptionSet<IPC::SendOption>, std::__1::optional<IPC::ConnectionAsyncReplyHandler>, WebKit::AuxiliaryProcessProxy::ShouldStartProcessThrottlerActivity)::$_1, void, IPC::Decoder*>::call(IPC::Decoder*) (in WebKit) WebKit IPC::Connection::cancelAsyncReplyHandlers() (in WebKit) WebKit IPC::Connection::invalidate() (in WebKit) WebKit WebKit::AuxiliaryProcessProxy::shutDownProcess() (in WebKit) WebKit WebKit::WebProcessProxy::shutDown() (in WebKit) WebKit WebKit::WebProcessProxy::processDidTerminateOrFailedToLaunch(WebKit::ProcessTerminationReason) (in WebKit) WebKit WebKit::WebProcessProxy::didClose(IPC::Connection&) (in WebKit) WebKit IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (in WebKit) WebKit IPC::Connection::SyncMessageState::ConnectionAndIncomingMessage::dispatch() (in WebKit) WebKit WTF::Detail::CallableWrapper<IPC::Connection::SyncMessageState::processIncomingMessage(IPC::Connection&, std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >&)::$_5, void, >::call() (in WebKit) JavaScriptCore WTF::RunLoop::performWork() (in JavaScriptCore) JavaScriptCore WTF::RunLoop::performWork(void*) (in JavaScriptCore) CoreFoundation ___CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (in CoreFoundation) CoreFoundation ___CFRunLoopDoSource0 (in CoreFoundation) CoreFoundation ___CFRunLoopDoSources0 (in CoreFoundation) CoreFoundation ___CFRunLoopRun (in CoreFoundation) CoreFoundation _CFRunLoopRunSpecific (in CoreFoundation) GraphicsServices _GSEventRunModal (in GraphicsServices) UIKitCore -[UIApplication _run] (in UIKitCore) UIKitCore _UIApplicationMain (in UIKitCore) homework main (in homework:main.m:39) dyld start (in dyld)

Hi Team, We are trying to upload a file or an image using the component WKWebView. How we can do it? Should we need to use another approach? Do you have any suggestion or any demo project? Thanks in advance!

I'm hoping that others may be able to assist with my first app submission. **Guideline 2.1 - Performance - App Completeness Issue Description** The app still exhibited one or more bugs that would negatively impact App Store users. Bug description: The app did not load its content. Review device details: Device type: iPad Air (5th generation) OS version: iPadOS 18.3.1 The app pulls in a website embedded to allow them to login to their accounts/place orders. I've tested it on multiple physical devices and using the simulator. It works fine and loads without any issues. The review team would not give me any other information or support to help get this app approved. Any help would be appreciated.

We have a PWA app developed by our company. In order to distribute this app to users' iPhones, we put this PWA app inside an XCode app. That means we put a WebView in XCode to display the PWA URL. Everything works perfect, except for location access. The PWA app access the device location. When the first time the app acess location, it asks for user consent two times, by PWA app and by the XCode app. This is fine. When the user clicks Allow, the XCode app preserves the user choice and never asks again. However, the PWA app keeps on asking user permission every day. If we close the app open again, it will ask one more time. That means twice daily. But if we close and open the app for a third time, it will not ask. It remembers the user choice only for 24 hours. If we install the PWA app directly in iPhone (that means if we add the URL as bookmark in home screen), it is asking for location permission only once. However, when we put this app inside an XCode app it is asking every day. This affects the user experience, and as our users are not tech savvy, causing many issues. Is there a way to force the PWA app inside XCode app to remember the user choice? Any help is very much appreciated. Thanks,

Prime Objective I am trying to have a scroll view with a fixed header, a fixed footer, and a WKWebView in between. Using JavaScript, the height of the webView is determined and set to be large enough to hold the entire content. The Problem When selecting text on the webView, the view does not scroll when the edges are reached (this works if the webView is shown without being embedded in a Scroll view, or if it is the last element) What did I try? I tried reading the scroll view, or adding a gesture recognizer, but all of that does not work because the selection is essentially a system task Sourcecode Sourcecode to demonstrate the issue can be found on GitHub

ISAC Client is crashing on macOS 15.4 Beta 1 which is from from the WebKit engine the underlying framework of WKWebView. And the "ResourceLoadNotifier" is from WebKit's internal framework.It seems to be related to resource loading failure which is potentially triggered by changes in macOS 15.4 Beta.

Hi all! I have been working on a web speech recognition service using the Web Speech API. This service is intended to work on smartphones, primarily Chrome on Android and Safari (or WebKit WebView) on iOS. In my specific use case, I need to set the properties continuous = true and interimResults = true. However, I have noticed that interimResults = true does not always work as expected in WebKit. I understand that this setting should provide fast, native, on-device speech recognition with isFinal = false. However, at times, the recognition becomes throttled and slow, yielding isFinal = true and switching to cloud-based recognition. To confirm whether the recognition is cloud-based, I tested it by disabling the internet connection before starting speech recognition. In some cases, recognition fails entirely, which suggests that requiresOnDeviceRecognition = false is being applied. (Reference: SFSpeechRecognitionRequest.requiresOnDeviceRecognition) I believe this is not the expected behavior when setting interimResults = true. I have researched the native services used by the Web Speech API on iOS devices, and the following links seem relevant: • SFSpeechRecognizer • SFSpeechRecognitionRequest.shouldReportPartialResults • SFSpeechRecognizer.supportsOnDeviceRecognition • Recognizing speech in live audio • Apple Developer Forums Discussion I found that setRequiresOnDeviceRecognition and setShouldReportPartialResults appear to be set correctly, but apparently, they do not work as expected: WebKit Source Code

On iOS 18, when setting the src attribute of an tag to a custom scheme (e.g., myapp://image.png) or an HTTP URL (http://example.com/image.png), if crossorigin="anonymous" is applied, the image fails to load. Additionally, images affected by this issue cannot be drawn to a , as the browser treats them as tainted and blocks access to their pixel data. This issue did not occur in previous iOS versions and seems to be a regression in iOS 18. Steps to Reproduce: Open an HTTPS-hosted H5 page in Safari on iOS 18. Add an tag with crossorigin="anonymous" and set src to either: A custom scheme: <img src="myapp://image.png" crossorigin="anonymous"> An HTTP URL (even from the same origin): <img src="http://example.com/image.png" crossorigin="anonymous"> Observe that the image does not load. Attempt to draw the image onto a and retrieve its data: const canvas = document.createElement("canvas"); const ctx = canvas.getContext("2d"); const img = new Image(); img.crossOrigin = "anonymous"; img.src = "http://example.com/image.png"; // or "myapp://image.png" img.onload = () => { ctx.drawImage(img, 0, 0); try { console.log(canvas.toDataURL()); // Expect base64 image data } catch (error) { console.error("Canvas is tainted:", error); } }; Notice that the image is blocked, and any attempt to access pixel data results in a CORS error. Expected Behavior: * The image should be displayed if it is accessible under normal CORS rules. * The API should allow access to the image data unless explicitly blocked by the server’s CORS policy. Actual Behavior: The image fails to load when crossorigin="anonymous" is applied. The API does not allow access to the image data, treating it as tainted. Removing crossorigin="anonymous" allows the image to display in some cases, but this is not a viable workaround when CORS enforcement is required. Regression: Works correctly on: iOS 17 and earlier Broken on: iOS 18 Environment: Device: iPhone/iPad iOS Version: 18.0+ Browser: Safari Suggested Fix: Apple should investigate this regression and allow custom schemes and HTTP images to be correctly handled under CORS policies when crossorigin="anonymous" is set. If the source allows cross-origin requests, Safari should not block the image or its use in .

I am experiencing a critical issue with WKWebView navigation in iOS 18.2 beta, specifically regarding the function webView.loadFileURL(_:allowingReadAccessTo:). In previous versions of iOS, this function works as expected when loading valid file URLs from the app’s local directory (e.g., Application Support). However, in iOS 18.2 beta, the function fails to complete the navigation, producing a provisional navigation failure with WebKitErrorDomain, code 102 (Frame load interrupted). This issue severely impacts our app’s ability to load essential local resources, breaking core functionality. Here’s a summary of the troubleshooting steps and findings: File and Directory Verification: The url provided to loadFileURL is valid. Both the file path and parent directory exist within the app’s sandbox, and the directory is accessible. Configuration: The code specifies the parent directory in the allowingReadAccessTo parameter to meet sandboxing requirements, which works on iOS 18.1 and prior releases. Testing on Stable iOS Versions: The issue is exclusive to iOS 18.2 beta; testing on earlier stable iOS releases confirms that the function works as intended. Impact: This regression severely disrupts the app’s navigation and content loading, effectively blocking access to local resources required for the WKWebView to display content properly. The error log returned in the console is as follows: > Error Domain=WebKitErrorDomain Code=102 "Frame load interrupted" UserInfo={_WKRecoveryAttempterErrorKey=<WKReloadFrameErrorRecoveryAttempter: 0x303dd67e0>, NSErrorFailingURLStringKey=file:///var/mobile/Containers/Data/Application/4D128818-7E51-460E-B5D4-D2D70363EFA0/Library/, NSErrorFailingURLKey=file:///var/mobile/Containers/Data/Application/4D128818-7E51-460E-B5D4-D2D70363EFA0/Library/, NSLocalizedDescription=Frame load interrupted} We suspect this may be due to a change in WebKit permissions in iOS 18.2 beta that affects local file handling within WKWebView. Given that the our app relies heavily on these resources, we kindly request this issue be addressed promptly. If any additional information or sample code is required, please let us know, and we will gladly provide further details to assist in resolving this issue. Thank you for your attention and support. Best regards, Isabela

Hi all, Chrome has it already - animation-timeline aka scroll-animations. I can nowhere find any informations on what's the status in Safari/Webkit. Seems like they do not have it on the agenda at all? Does anyone know anything - I wanted to push a feature request for that - but also seem there is no feature request list anymore for webkit. See: https://www.w3.org/TR/scroll-animations/ Cheers and kind regards!

How can i add Authorization header to a wkwebview. I checked https://developer.apple.com/documentation/foundation/nsurlrequest#1776617 which says Authorization header is a reserved http header and shouldn’t be set. I want to set it when requesting a url to the server which will be used for verification. How can i do that?

Hi, We have a native application with a webview part. When we open the app, we load webview resources in a false foreground. The webview communicates with the native part to query local variables, among other things. We have noticed that for the past few weeks, when the biometric component is presented to enter the fingerprint or faceId, while the component is displayed, the webview does not respond. We do not see the calls made by the webview, nor can we respond to them. Even if you open the Safari debugger, the webview does not respond UNTIL you close the biometric component in the native part. This has created a big problem in our app, and we wanted to know if it is an issue you had on your radar. Thank you very much.

I’m developing an app that has a Fitbit login page embedded in a WKWebView. On the Fitbit login page, there is a Google login button. When I try to log in to Fitbit via Google, some devices redirect back to the Fitbit login page even after entering the correct Google credentials. However, it works on the second attempt. I tested the same URL in the default browser, and it works fine when the page is loaded in the browser instead of inside the WebView. I tried the following workarounds but was unable to fix the issue: 1. Enabled JavaScript in WebView. 2. Tried cookie synchronization between WKWebsiteDataStore and HTTPCookieStorage.

Dear Apple Developer Experts, We're experiencing an intermittent issue with WKWebView in our macOS application where local HTML file access is occasionally denied by the sandbox, despite proper implementation and permissions. We seek your guidance in understanding and resolving this issue. Issue Description: The WKWebView occasionally fails to load local HTML files stored in the app's Contents/Resources directory Error occurs in WebKit Networking Process with sandbox denial Issue is intermittent and can be resolved by app restart or WebKit Networking Process restart Affects all local HTML files in the same directory once the issue occurs Technical Details: Error from Kernel Log: 2025-02-07 14:57:17.179821 +0800 kernel Sandbox: com.apple.WebKit.Networking(58661) deny(1) file-read-data /Applications/DingTalk.app/Contents/Resources/webcontent/contact-2024.html WKWebView Delegate Error (captured in WKNavigationDelegate method): (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error Error Details: Domain: NSPOSIXErrorDomain Code: 1 Description: "Operation not permitted" UserInfo: { networkTaskMetricsPrivacyStance: Unknown, _NSURLErrorFailingURLSessionTaskErrorKey: LocalDataTask &lt;3694CA1E-481B-4E06-975D-E3A56AD56C0F&gt;.&lt;1&gt;, _kCFStreamErrorDomainKey: 1, _kCFStreamErrorCodeKey: 1 } Key Observations: Error is captured in WKNavigationDelegate's didFailProvisionalNavigation method The issue affects all local HTML files in the same directory once it occurs Temporary workarounds we've discovered: Restarting the application completely resolves the issue Without restarting the application, terminating the "WebKit Networking Process" via Activity Monitor causes the process to automatically restart, and this resolves the issue and load works again Additional Information: We've collected complete system diagnostics (system_logs.logarchive) at the time of failure The issue appears similar to discussions in Apple Developer Forums (https://developer.apple.com/forums/thread/110072), though we're uncertain if it's the same root cause We've prepared a minimal demo project demonstrating: Our release version app can be downloaded from: https://dtapp-pub.dingtalk.com/dingtalk-desktop/mac_dmg/Release/M1-Beta/DingTalk_v7.6.45_43521682_universal.dmg?spm=0.0.0.0.UuwovG&amp;file=DingTalk_v7.6.45_43521682_universal.dmg for examining our app's codesign, sandbox, and entitlements configurations if needed Important Investigation Finding: We attempted to simulate the issue by using chmod 000 /path/to/test.html, but this produces a different error: CopyError Domain=NSURLErrorDomain Code=-1102 Description="You do not have permission to access the requested resource." UserInfo={ NSLocalizedDescription=You do not have permission to access the requested resource., NSErrorFailingURLStringKey=file:///Users/sunus/Library/Developer/Xcode/DerivedData/WKWebViewLocalDemo-eumardnlfbmwgnhkaadglsrrhzhs/Build/Products/Debug/WKWebViewLocalDemo.app/Contents/Resources/test.html, NSUnderlyingError=0x600003aedc50 {Error Domain=kCFErrorDomainCFNetwork Code=-1102 "(null)"} } This error is distinctly different from our original issue's "Operation not permitted" error, suggesting that the sandbox denial we're experiencing is not a simple file permission issue. Questions: Is this a known issue with the WebKit sandbox in recent macOS versions? Are there recommended best practices or workarounds to prevent this sandbox denial? Could this be related to the WebKit Networking Process's sandbox configuration? Are there additional diagnostics or logs we should collect to help investigate this issue? We appreciate your assistance in investigating this issue. Please let us know if you need any additional information or clarification. STEPS TO REPRODUCE Open App Then loads the local file in /WKWebViewLocalDemo.app/Contents/Resources/test.html PS, We also submit a DTS &amp; Feedback DTS:Case-ID: 11876957 Feedback-ID: FB16493282 sysdiagnose is in the Feedback-ID: FB16493282 is uploaded