2026/09/21 23:08:03 [ERROR] HTTPClient: failed to check valid http response [ErrorInfo :mime: no media type code=50000 internal error statusCode=500] See https://help.ably.io/error/50000 2026/09/21 23:08:03 [ERROR] HTTPClient: error handling response: [ErrorInfo :mime: no media type code=50000 internal error statusCode=500] See https://help.ably.io/error/50000 device_test.go:37: proto_message_decoding_test.go:42: proto_message_decoding_test.go:140: /opt/hostedtoolcache/go/1.25.14/x64/src/testing/testing.go:1872 +0x419 /opt/hostedtoolcache/go/1.25.14/x64/src/testing/testing.go:1875 +0x683 /opt/hostedtoolcache/go/1.25.14/x64/src/runtime/panic.go:783 +0x132 /home/runner/work/ably-go/ably-go/internal/ablytest/sandbox.go:172 /home/runner/work/ably-go/ably-go/internal/ablytest/sandbox.go:159 +0xc5 /home/runner/work/ably-go/ably-go/internal/ably/auth_integration_test.go:45 +0x33c /opt/hostedtoolcache/go/1.25.14/x64/src/testing/testing.go:1934 +0x21d /opt/hostedtoolcache/go/1.25.14/x64/src/testing/testing.go:1997 +0x9d3