Update codegen for cleanup/less verbosity

codegen/common/rest/handlers/util.go

@@ -0,0 +1,17 @@
+package handlers
+
+import (
+	"net/http"
+)
+
+// Edit this file in `codegen/common/rest/handlers/util.go`;
+// any changes under [service] will be overwritten by codegen.
+
+func serveHTTP(value interface{}, w http.ResponseWriter, r *http.Request) bool {
+	switch fn := value.(type) {
+	case func(http.ResponseWriter, *http.Request):
+		fn(w, r)
+		return true
+	}
+	return false
+}