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Update web preview docs to use 127.0.0.1 instead of 0.0.0.0 #1178

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Jul 25, 2025
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Update web preview docs to use 127.0.0.1 instead of 0.0.0.0 #1178

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6 changes: 3 additions & 3 deletions docs/sandboxes/web-preview.mdx
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Expand Up @@ -23,7 +23,7 @@ A "View Web Preview" button appears on the agent trace page once the server star

You configure Web Preview commands in a manner similar to Setup Commands, likely within the same repository settings area (e.g., `https://codegen.com/{your_org}/{repo_name}/settings/web-preview`).

You'll provide the command(s) necessary to start your development server. Ensure that your server is configured to listen on an appropriate host (often `0.0.0.0`) and a predictable port that Codegen can then expose.
You'll provide the command(s) necessary to start your development server. Ensure that your server is configured to listen on an appropriate host (often `127.0.0.1`) and a predictable port that Codegen can then expose.

<Warning>
The web server started for Web Preview **MUST** listen on port 3000. Codegen
Expand All @@ -42,12 +42,12 @@ npm run dev

```bash
# For a Python/Django project
python manage.py runserver 0.0.0.0:8000
python manage.py runserver 127.0.0.1:3000
```

```bash
# For a Ruby on Rails project
bundle exec rails server -b 0.0.0.0
bundle exec rails server -b 127.0.0.1 -p 3000
```

<Tip>
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