The server rejects your push. The terminal flashes red. Identity-Aware Proxy is blocking you. You need to switch branches, but access is locked behind enforced authentication. This is where Git checkout meets Identity-Aware Proxy, and the intersection changes how you work.
Identity-Aware Proxy (IAP) secures resources by authenticating and authorizing users before allowing access. When integrated with Git workflows, it adds a layer of controlled visibility and branch security. Your git checkout command will only succeed if your identity passes IAP’s verification. No cached token, no entry. This eliminates unauthorized branch access for repos guarded behind cloud endpoints.
When Git is hosted on a backend shielded by IAP—such as repositories exposed via Google Cloud—IAP intercepts the request. It checks the identity of the user against defined policies, and only then forwards the traffic. This means that git fetch and git checkout are not just local commands anymore; they become authenticated requests enforced at the network level.
Implementing Git checkout with Identity-Aware Proxy requires configuring OAuth2 credentials to grant Git clients valid tokens. These tokens must be refreshed before they expire. If you use HTTPS for repo access, the Git client will need to handle the browser-based IAP login flow or use a headless authentication script to inject tokens. SSH-based access requires tunneling through an authenticated proxy that speaks IAP.