Rate limit headers (X-RateLimit) in Rest API - Mini Project: Build & Apply

Rate limit headers (X-RateLimit)

📖 Scenario: You are building a simple REST API server that tracks how many requests a user makes. To help users avoid being blocked, you want to send special headers called X-RateLimit headers. These headers tell the user how many requests they can still make before hitting the limit.

🎯 Goal: Create a small program that stores user request counts, sets a maximum limit, calculates remaining requests, and sends the correct X-RateLimit headers in the API response.

📋 What You'll Learn

Create a dictionary called user_requests with exact user IDs and their request counts

Create a variable called max_requests with the exact value 100

Use a for loop with variables user and count to iterate over user_requests.items()

Calculate remaining requests for each user as max_requests - count

Print the X-RateLimit-Limit and X-RateLimit-Remaining headers for each user exactly as shown

💡 Why This Matters

🌍 Real World

APIs often limit how many requests a user can make to protect the server. Sending rate limit headers helps users know their limits and avoid errors.

💼 Career

Understanding rate limiting and headers is important for backend developers and API designers to build reliable and user-friendly services.

1

Create the user request counts dictionary

Create a dictionary called user_requests with these exact entries: 'user1': 45, 'user2': 80, 'user3': 20

Rest API

# Create the user_requests dictionary with exact entries
# Your code here

Need a hint?

Use curly braces {} to create a dictionary. Separate keys and values with colons, and separate pairs with commas.

2

Set the maximum request limit

Create a variable called max_requests and set it to the number 100

Rest API

user_requests = {'user1': 45, 'user2': 80, 'user3': 20}
# Create max_requests variable and set it to 100
# Your code here

Need a hint?

Just write max_requests = 100 on a new line.

3

Calculate remaining requests for each user

Use a for loop with variables user and count to iterate over user_requests.items(). Inside the loop, calculate remaining requests as remaining = max_requests - count

Rest API

user_requests = {'user1': 45, 'user2': 80, 'user3': 20}
max_requests = 100
# Use a for loop to calculate remaining requests for each user
# Your code here

Need a hint?

Use for user, count in user_requests.items(): to loop. Then subtract count from max_requests.

4

Print the X-RateLimit headers for each user

Inside the for loop, print the headers exactly like this: X-RateLimit-Limit: 100 and X-RateLimit-Remaining: remaining where remaining is the calculated value. Use print(f"X-RateLimit-Limit: {max_requests}") and print(f"X-RateLimit-Remaining: {remaining}").

Rest API

user_requests = {'user1': 45, 'user2': 80, 'user3': 20}
max_requests = 100
for user, count in user_requests.items():
    remaining = max_requests - count
    # Print the X-RateLimit headers for each user
    # Your code here

Need a hint?

Use print(f"X-RateLimit-Limit: {max_requests}") and print(f"X-RateLimit-Remaining: {remaining}") inside the loop.