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Course 4907

Course 4907

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Which git command should you use before pushing to ensure your branch is up to date with main without creating a merge commit?

git merge main

git fetch main

git pull origin main

git rebase main

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A developer says: "I put the user's password in the JWT payload because it's encrypted." What's wrong with this?

Passwords in JWTs cause authentication loops

JWTs cannot store text longer than 100 characters

JWTs expire too quickly for password storage

JWT payload is only encoded (base64), not encrypted - anyone can read it

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Why should state updates in Redux reducers be immutable?

To make code faster on older browsers

To comply with TypeScript requirements

To reduce memory usage

For change detection and time-travel debugging

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After successfully creating a new user via `POST /users`, what is the correct HTTP status code to return?

`204 No Content` - the server has no content to return

`200 OK` - the request succeeded

`301 Moved Permanently` - the new user is at a different location

`201 Created` - the resource was successfully created

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What does "stateless" mean in REST architecture?

Each request contains all information needed; the server doesn't store session state between requests

The server maintains a database of all previous requests from each client

Clients are not allowed to store any data locally in cookies or localStorage

Every response must be cached by the browser for future use

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What does "caching" mean in RTK Query?

Preventing any network requests

Compressing HTTP responses

Storing data in localStorage

Reusing previous responses

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In Redux, what is the store responsible for?

Rendering React components and managing the DOM tree

Managing browser cookies, localStorage, and session data

Holding the application state and allowing state updates through dispatched actions

Making HTTP requests to the backend and handling API responses

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What is the difference between `401 Unauthorized` and `403 Forbidden`?

Both mean the user is not logged in

`401` means no valid authentication, `403` means authenticated but lacks permission

`403` means the resource doesn't exist, `401` means it does

`401` is for expired tokens, `403` is for invalid tokens

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Why is it bad practice to always return `200 OK` with an error in the body like `{"error": "not found"}`?

Browsers automatically redirect when they see a 200 response with any body content

JSON format is not supported by all HTTP clients and browsers

Error responses must be in XML format according to HTTP specifications

Monitoring tools and API gateways read HTTP status codes, not body content, so they can't detect errors

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When is it appropriate to return `204 No Content` in a REST API?

When the requested resource was not found

When the client sends invalid data in the request

When creating a new resource successfully

When a request is successfully processed but there's no response body to return (e.g., after DELETE)

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