Preview channels in Firebase - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ service_behavior

intermediate

How does a Firebase Preview Channel behave after 7 days?

You create a Firebase Preview Channel to test your web app deployment. What happens to this preview channel after 7 days?

A The preview channel is paused but not deleted after 7 days.

B The preview channel remains active indefinitely until manually deleted.

C The preview channel automatically expires and is deleted after 7 days.

D The preview channel is converted to a production channel after 7 days.

💡 Hint

Think about how preview channels are designed to be temporary for testing.

Firebase Preview Channels are temporary and automatically expire after 7 days to avoid clutter and unnecessary resource use.

❓ Architecture

intermediate

What is the main purpose of Firebase Preview Channels in deployment architecture?

Why would a developer use Firebase Preview Channels in their deployment workflow?

A To permanently host the production version of the app.

B To test changes in a live environment without affecting the production site.

C To backup the production app automatically.

D To monitor user analytics in real-time.

💡 Hint

Consider the need to test new features safely before going live.

Preview Channels allow developers to share and test changes in a live-like environment without impacting the main production site.

❓ security

advanced

Which security feature is automatically applied to Firebase Preview Channels URLs?

Firebase Preview Channels generate unique URLs for testing. What security feature do these URLs have by default?

A They are protected by IP whitelisting automatically.

B They require Firebase Authentication to access.

C They are publicly accessible without restrictions.

D They use unguessable, unique URLs to limit access.

💡 Hint

Think about how Firebase prevents random users from accessing preview builds.

Firebase Preview Channels use unique, hard-to-guess URLs to restrict access without requiring authentication or IP restrictions.

✅ Best Practice

advanced

What is a recommended best practice when using Firebase Preview Channels for team collaboration?

How should teams manage Firebase Preview Channels to ensure smooth collaboration and avoid confusion?

A Share the preview channel URL only with relevant team members and delete channels after testing.

B Keep all preview channels active indefinitely for future reference.

C Use the same preview channel URL for all features to simplify sharing.

D Avoid using preview channels and deploy directly to production for faster feedback.

💡 Hint

Think about managing temporary resources and access control.

Sharing URLs only with relevant people and deleting channels after use keeps the environment clean and secure.

🧠 Conceptual

expert

What happens if you deploy a new preview channel with the same ID as an existing one in Firebase Hosting?

You deploy a new preview channel using the same channel ID as an existing preview channel. What is the result?

A The existing preview channel is replaced with the new deployment, updating the URL content.

B Firebase creates a second preview channel with the same ID, causing a conflict error.

C Both preview channels run independently with different URLs.

D The deployment fails with an error because channel IDs must be unique.

💡 Hint

Consider how Firebase manages preview channels by ID.

Deploying to an existing preview channel ID updates the content at that channel's URL, replacing the previous deployment.