Error demo

These requests intentionally fail. Server errors return a safe HTTP 500 response without exposing a stack trace. A stream that fails after headers commit keeps its HTTP 200 response and the shell already sent.

Before headers commit

Server failure (HTTP 500)
Server timeout (HTTP 500)
API failure (HTTP 500)

After headers commit

Stream failure (HTTP 200): the navigation, shell, and footer remain usable even though the delayed work fails.