aspnetcore: Blazor 0.2.0 applications fail to load in Safari on macOS/iOS

Environment:

• macOS High Sierra 10.13.4 (17E199)
• dotnet 2.1.300-preview2-008533
• Blazor 0.2.0

Repro steps:

1. Create a blazer stand-alone (or hosted) app from the latest templates
2. Build with dotnet build $project
3. Run with dotnet run --project $project

Expected:

Blazor app runs in Safari as it did for the 0.1.0 runtime and templates

Actual

• Safari attempts to load and fails with This webpage was reloaded because a problem occurred.
• Safari attempts to reload.
• Safari stops trying to reload after repeated failures.

Additional details:

• I attempted to open the JavaScript Console to see what was happening, but the console is closed due to the errors.
• I don’t see any errors in the logs, just repeated requests for the same files with the expected HTTP 304 responses.