avoid empty header

Author: alexanderzobnin

cmd/root.go

@@ -65,10 +65,10 @@ func init() {
 	rootCmd.PersistentFlags().String("api-token", "", "API Token. Will be sent in as a Bearer in the Authorization header")
 	rootCmd.PersistentFlags().String("api-token-issuer", "", "API Token Issuer. API responsible for issuing the API Token. Used in the Client Credentials flow") //nolint:lll
 	rootCmd.PersistentFlags().String("api-audience", "", "API Audience. Used when performing the Client Credentials flow")
-	rootCmd.PersistentFlags().String("client-id", "", "Client ID. Sent to the Token Issuer during the Client Credentials flow")                            //nolint:lll
-	rootCmd.PersistentFlags().String("client-secret", "", "Client Secret. Sent to the Token Issuer during the Client Credentials flow")                    //nolint:lll
-	rootCmd.PersistentFlags().StringArray("api-scopes", []string{}, "API Scopes (repeat option for multiple values). Used in the Client Credentials flow") //nolint:lll
-	rootCmd.PersistentFlags().StringArray("custom-headers", []string{}, "Custom HTTP Headers (repeat option for multiple values)")                         //nolint:lll
+	rootCmd.PersistentFlags().String("client-id", "", "Client ID. Sent to the Token Issuer during the Client Credentials flow")                              //nolint:lll
+	rootCmd.PersistentFlags().String("client-secret", "", "Client Secret. Sent to the Token Issuer during the Client Credentials flow")                      //nolint:lll
+	rootCmd.PersistentFlags().StringArray("api-scopes", []string{}, "API Scopes (repeat option for multiple values). Used in the Client Credentials flow")   //nolint:lll
+	rootCmd.PersistentFlags().StringArray("custom-headers", []string{}, "Custom HTTP headers in 'Header: value' format (repeat option for multiple values)") //nolint:lll
 	rootCmd.PersistentFlags().Bool("debug", false, "Enable debug mode - can print more detailed information for debugging")
 
 	_ = rootCmd.Flags().MarkHidden("debug")

internal/fga/fga.go

@@ -108,7 +108,9 @@ func (c ClientConfig) getCustomHeaders() map[string]string {
 		if len(parts) == 2 {
 			head := strings.TrimSpace(parts[0])
 			value := strings.TrimSpace(parts[1])
-			headers[head] = value
+			if head != "" {
+				headers[head] = value
+			}
 		}
 	}
 	return headers