Invalid HTTP response code when loading tileset from URL on Android.

[argallegos]

Forum post

A user is these errors when attempting to load a 3D Tiles dataset from a custom URL on Android.

invalid HTTP response code received. URL: https://<example.com>/private.json, HTTP code: 0, content length: 0, actual payload size: 0
2021-09-10 03:26:51.806 22623-22653/com.test.local D/UE4: [2021.09.09-21.56.51:806][ 27]LogHttp: Warning: 0x6f1af08040: request failed, libcurl error: 35 (Error)
2021-09-10 03:26:51.807 22623-22653/com.test.local D/UE4: [2021.09.09-21.56.51:807][ 27]LogHttp: Warning: 0x6f1af08040: libcurl info message cache 0 (TLSv1.2 (OUT), TLS Unknown, Certificate Status (22):slight_smile:
2021-09-10 03:26:51.807 22623-22653/com.test.local D/UE4: [2021.09.09-21.56.51:807][ 27]LogHttp: Warning: 0x6f1af08040: libcurl info message cache 1 (TLSv1.2 (OUT), TLS handshake, Client hello (1):slight_smile:
2021-09-10 03:26:51.807 22623-22653/com.test.local D/UE4: [2021.09.09-21.56.51:807][ 27]LogHttp: Warning: 0x6f1af08040: libcurl info message cache 2 (TLSv1.2 (IN), TLS Unknown, Unknown (21):slight_smile:
2021-09-10 03:26:51.807 22623-22653/com.test.local D/UE4: [2021.09.09-21.56.51:807][ 27]LogHttp: Warning: 0x6f1af08040: libcurl info message cache 3 (TLSv1.2 (IN), TLS alert, Server hello (2):slight_smile:
2021-09-10 03:26:51.807 22623-22653/com.test.local D/UE4: [2021.09.09-21.56.51:807][ 27]LogHttp: Warning: 0x6f1af08040: libcurl info message cache 4 (error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure)
2021-09-10 03:26:51.821 22623-22653/com.test.local D/UE4: [2021.09.09-21.56.51:821][ 27]LogCesium: Error: [2021-09-10 03:26:51.821] [error] [Tileset.cpp:536] Unhandled error for tileset https://<example.com>/private.json: Request failed.

The URL works fine on Windows, the issue only seems to occur when building for Android.

[kring]

I don't think this is something we can fix, so I'm closing it. Unreal Engine's libcurl on Android is not able to access that URL for some reason. It could be because the server is using a certificate that isn't trusted by the Android device (or at least not by Unreal's libcurl on that device). Or perhaps the host isn't accessible at all due to a networking problem.