Rate limiting in Laravel - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What happens when a user exceeds the rate limit in Laravel?

In Laravel, if a user sends too many requests exceeding the defined rate limit, what is the default response behavior?

A Laravel returns a 429 Too Many Requests HTTP status with a retry-after header.

B Laravel queues the requests and processes them later without any error.

C Laravel automatically redirects the user to the homepage.

D Laravel ignores the limit and processes all requests normally.

💡 Hint

Think about HTTP status codes related to client request limits.

Laravel uses the 429 status code to indicate too many requests. It also sends a retry-after header to tell the client when to try again.

📝 Syntax

intermediate

Which code snippet correctly defines a rate limiter in Laravel?

Choose the correct way to define a rate limiter named 'api' that allows 60 requests per minute.

A RateLimiter::for('api', fn (Request $request) => Limit::perMinute(60));

B RateLimiter::define('api', function() { return 60; });

C RateLimiter::set('api', 60);

D RateLimiter::limit('api', 60)->perMinute();

💡 Hint

Look for the method that uses a closure and Limit::perMinute.

The correct syntax uses RateLimiter::for with a closure returning Limit::perMinute(60).

❓ state_output

advanced

What is the value of $remaining after 3 requests if the limit is 5 per minute?

Given this Laravel code snippet:

use Illuminate\Support\Facades\RateLimiter;

$key = 'user-123';
$limit = RateLimiter::remaining($key, 5);

If the user has made 3 requests so far this minute, what is the value of $limit?

Laravel

use Illuminate\Support\Facades\RateLimiter;

$key = 'user-123';
$limit = RateLimiter::remaining($key, 5);

A 3

B 2

C 5

D 0

💡 Hint

Remaining means how many requests are left before hitting the limit.

If the limit is 5 and 3 requests were made, 2 requests remain.

🔧 Debug

advanced

Why does this Laravel rate limiter code cause a runtime error?

Consider this code:

RateLimiter::for('login', function (Request $request) {
    return Limit::perMinute(10)->by($request->ip());
});

What causes the error?

Laravel

RateLimiter::for('login', function (Request $request) {
    return Limit::perMinute(10)->by($request->ip());
});

A Missing semicolon after Limit::perMinute(10).

B Using a closure instead of an arrow function.

C Accessing $request->ip as a property instead of calling $request->ip() method.

D Not importing the Request class.

💡 Hint

Check how to get the IP address from the request object.

The $request->ip is a method call, so it should be $request->ip() to get the IP address.

🧠 Conceptual

expert

How does Laravel's rate limiter uniquely identify users for limiting?

Which method does Laravel use by default to distinguish different users when applying rate limits?

A It uses the user agent string from the browser.

B It uses only the user’s IP address regardless of authentication.

C It uses a random token generated per request.

D It uses the combination of user IP address and authenticated user ID if available.

💡 Hint

Think about how Laravel can differentiate logged-in users and guests.

Laravel combines the user ID if logged in, or IP address if not, to uniquely identify users for rate limiting.