Summary

This PR adds two improvements for testing and integration:

1. Handler() Method

Exposes the internal HTTP handler for use with test frameworks and custom servers:

// Handler returns the underlying http.Handler for use with custom servers or testing.
func (v *V) Handler() http.Handler {
    return v.mux
}

Use cases:

• Direct handler testing with gost-dom, httptest, etc.
• Custom server integration (embedding Via in existing servers)
• Middleware wrapping for auth, logging, etc.

2. SSE Closed Pipe Error Suppression

When browsers/clients close before SSE handlers detect the closure, Via logged noisy errors:

[error] msg="PatchElements failed: io: read/write on closed pipe"

Now checks if context is cancelled before logging, avoiding noise during normal shutdown and testing.

Testing

Successfully tested with gost-dom headless browser:

• Full SSE/Datastar reactivity testing
• Button clicks triggering server actions
• ~50ms test execution (vs seconds with real browser)

Example test using the new Handler() method:

func TestMyPage(t *testing.T) {
    ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
    defer cancel()

    v := via.New()
    v.Page("/test", func(c *via.Context) { /* ... */ })

    b := browser.New(
        browser.WithScriptEngine(v8engine.DefaultEngine()),
        browser.WithContext(ctx),
        browser.WithHandler(v.Handler()), // New method!
    )
    defer b.Close()

    win, _ := b.Open("http://localhost/test")
    // assertions...
}

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 4.5 [email protected]