Update fetch for static page gen, fix DOM patching

go/wasmruntime/fetch.go

@@ -8,8 +8,17 @@ import (
 	"strings"
 	"sync"
 	"syscall/js"
+
+	"kjol/httputil"
 )
 
+// Installing the transport here (rather than leaving it to each app's main)
+// keeps httputil's invariant true by construction: FetchGob / FetchJSON have a
+// transport exactly when they are running in the browser. That is what lets them
+// no-op during SSR instead of reporting a failure. Apps that need custom headers
+// or a base URL can wrap FetchBytes with httputil.SetClientTransport at startup.
+func init() { httputil.SetClientTransport(FetchBytes) }
+
 // absURL resolves a relative path against the current origin (a browser resolves
 // relative fetch URLs itself, but building the absolute URL keeps behavior
 // uniform — and lets non-browser hosts, e.g. tests, fetch too).