You may want to make changes to your container, such as installing a different version of a software or forwarding a new port. You'll rebuild your container for your changes to take effect.
**Forward a port statically:** As an example change, let's forward a port statically in the `.devcontainer/devcontainer.json` file.
> **Note:** Remote-Containers and Codespaces also take care of dynamic port forwarding, but there may be instances in which we want to statically declare a forwarded port.
**Open browser automatically:** As an example change, let's update the `portsAttributes` in the `.devcontainer/devcontainer.json` file to open a browser when our port is automatically forwarded.
- Open the `.devcontainer/devcontainer.json` file.
-Uncomment the `forwardedPorts` attribute and adjust the port number as needed.
-Modify the `"onAutoForward"` attribute in your `portsAttributes` from `"notify"` to `"openBrowser"`.
- Press <kbd>F1</kbd> and select the **Remote-Containers: Rebuild Container** or **Codespaces: Rebuild Container** command so the modifications are picked up.
5.**Refactoring - rename:**
- Open `hello.go`, select method name `Hello` press <kbd>F1</kbd> and run the **Rename Symbol** command.