docs: update rollout docs

internal/server/server.go

@@ -78,7 +78,8 @@ func (hs *HTTPServer) corsMiddleware(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Access-Control-Allow-Origin", "*")
 		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
-		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
+		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization, Accept")
+		w.Header().Set("Access-Control-Expose-Headers", "Content-Type, Content-Length")
 
 		if r.Method == "OPTIONS" {
 			w.WriteHeader(http.StatusOK)

pkg/registry/registry.go

@@ -132,7 +132,7 @@ func (c *RegistryClient) UploadFirmware(metadata FirmwareMetadata, firmwareFile
 	}
 	defer resp.Body.Close()
 
-	if resp.StatusCode != http.StatusOK {
+	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
 		body, _ := io.ReadAll(resp.Body)
 		return nil, fmt.Errorf("firmware upload failed with status %d: %s", resp.StatusCode, string(body))
 	}