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.github/steps/4-setup-django-rest-framework.md

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+## Step 4: Wire API hosting for the multi-tier application
+
+In this step, you will finalize API hosting for your **multi-tier application**:
+
+- Keep backend API on port `8000`.
+- Build Codespaces-aware API URL behavior using `$CODESPACE_NAME`.
+- Validate endpoints with `curl`.
+
+### :keyboard: Activity: Configure API base URL and host support
+
+> ![Static Badge](https://img.shields.io/badge/-Prompt-text?style=flat-square&logo=github%20copilot&labelColor=512a97&color=ecd8ff)
+>
+> ```prompt
+> Let's configure the Node.js API for Codespaces and localhost.
+>
+> - Backend runs on port 8000
+> - Build API base URL with $CODESPACE_NAME when available:
+>   https://$CODESPACE_NAME-8000.app.github.dev
+> - Keep localhost support when $CODESPACE_NAME is not set
+> - Verify /api/users and /api/activities with curl
+> ```
+
+1. Commit and push your changes to `build-octofit-app`.
+
+1. Wait for Mona to validate and share the next step.
+
+<details>
+<summary>Having trouble? 🤷</summary><br/>
+
+Verify `octofit-tracker/backend/src/server.ts` includes:
+
+- `CODESPACE_NAME`
+- `-8000.app.github.dev`
+
+</details>