Wow, you are right. I looked more carefully at the code that send me on this quest again and found some other issues there that I could resolve. Sorry for bothering you and thanks for taking the time to help me. The log noise is somewhat annoying, specifically in this case, because it seems to point at the origin of not being able to fetch a url while the actual problem could be elsewhere. Anyway, solved now. Thanks.

I did leave in the ? indeed. Apologies. I tried the same call in a macOS command line app also (did that before posting here, but forgot to mention it) and then it prints the content to the command line as expected. On tvOS however, the error below: will load 2022-07-25 14:04:45.348040+0200 DataCallBugDemo[35942:1740418] [] nw_protocol_get_quic_image_block_invoke dlopen libquic failed: dlopen(/usr/lib/libquic.dylib, 0x0005): tried: '/Users/home/Library/Developer/Xcode/DerivedData/DataCallBugDemo-bciyslbakihyhlgdfkvdrnedngsp/Build/Products/Debug-appletvsimulator/libquic.dylib' (no such file), '/Applications/Xcode.app/Contents/Developer/Platforms/AppleTVOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/tvOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/introspection/libquic.dylib' (no such file), '/Applications/Xcode.app/Contents/Developer/Platforms/AppleTVOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/tvOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libquic.dylib' (no such file), '/usr/lib/libquic.dylib' (no such file) 2022-07-25 14:04:45.480596+0200 DataCallBugDemo[35942:1740420] [boringssl] boringssl_metrics_log_metric_block_invoke(153) Failed to log metrics did load, data: 83 bytes 2022-07-25 14:04:45.560389+0200 DataCallBugDemo[35942:1740289] [UIFocus] Failed to update focus with context <UIFocusUpdateContext: 0x600003100320: previouslyFocusedItem=(null), nextFocusedItem=(null), focusHeading=None>. No additional info available. 2022-07-25 14:04:49.076286+0200 DataCallBugDemo[35942:1740289] [HardwareKeyboard] -[UIApplication getKeyboardDevicePropertiesForSenderID:shouldUpdate:usingSyntheticEvent:], failed to fetch device property for senderID (778835616971358212) use primary keyboard info instead. 2022-07-25 14:04:49.081580+0200 DataCallBugDemo[35942:1740289] [HardwareKeyboard] -[UIApplication getKeyboardDevicePropertiesForSenderID:shouldUpdate:usingSyntheticEvent:], failed to fetch device property for senderID (778835616971358212) use primary keyboard info instead. objc[35942]: Class _PathPoint is implemented in both /Applications/Xcode.app/Contents/Developer/Platforms/AppleTVOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/tvOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore (0x117f3a9a0) and /Applications/Xcode.app/Contents/Developer/Platforms/AppleTVOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/tvOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/TextInputUI.framework/TextInputUI (0x129bb35d8). One of the two will be used. Which one is undefined. objc[35942]: Class _PointQueue is implemented in both /Applications/Xcode.app/Contents/Developer/Platforms/AppleTVOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/tvOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore (0x117f3a978) and /Applications/Xcode.app/Contents/Developer/Platforms/AppleTVOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/tvOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/TextInputUI.framework/TextInputUI (0x129bb3600). One of the two will be used. Which one is undefined.

The compiler gives me this warning when I make it a do...catch block: 'catch' block is unreachable because no errors are thrown in 'do' block The single quote was a mistake, but removing it does not make a difference. But corrected in the git repo. I am still getting the exact same error but, predictably, is now preceded by a console message 'will load'.

I uploaded a project to Github that triggers the error: https://github.com/Kobes/DataCallBugDemo The project is nothing but an empty tvOS project with two lines of code added to ViewController.swift. The full error reads: `2022-07-21 19:07:48.850893+0200 DataCallBugDemo[32673:1601116] [] nw_protocol_get_quic_image_block_invoke dlopen libquic failed: dlopen(/usr/lib/libquic.dylib, 0x0005): tried: '/Users/myhome/Library/Developer/Xcode/DerivedData/DataCallBugDemo-bciyslbakihyhlgdfkvdrnedngsp/Build/Products/Debug-appletvsimulator/libquic.dylib' (no such file), '/Applications/Xcode.app/Contents/Developer/Platforms/AppleTVOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/tvOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/introspection/libquic.dylib' (no such file), '/Applications/Xcode.app/Contents/Developer/Platforms/AppleTVOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/tvOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libquic.dylib' (no such file), '/usr/lib/libquic.dylib' (no such file)` Some additional details: Xcode 13.4.1 (13F100) Simulator: Apple TV 4K (at 1080p), 2nd generation, tvOS 15.4

Yes, Data(contentsOf: URL) fails with the error I copied above. I could copy more lines, but they are just a bunch of paths on my system that were tried for the libquic file.