API gateway patterns in Rest API - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the main function of an API Gateway that routes requests.

Rest API

def api_gateway(request):
    if request.path == '/users':
        return [1](request)
    else:
        return '404 Not Found'

Drag options to blanks, or click blank then click option'

Aauthenticate_user

Bhandle_users_service

Cprocess_payment_service

Dlog_request

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a service unrelated to the '/users' path.

Using a function that only logs or authenticates instead of routing.

The API Gateway routes requests to the correct backend service. For '/users' path, it should call handle_users_service.

2fill in blank

medium

Complete the code to add authentication middleware in the API Gateway.

Rest API

def api_gateway(request):
    if not [1](request):
        return '401 Unauthorized'
    # Continue routing

Drag options to blanks, or click blank then click option'

Avalidate_token

Blog_request

Chandle_users_service

Dcache_response

Attempts:

3 left

💡 Hint

Common Mistakes

Using logging or caching functions instead of authentication.

Skipping authentication checks.

The API Gateway should validate the authentication token before routing requests. The function validate_token checks this.

3fill in blank

hard

Fix the error in the code that implements rate limiting in the API Gateway.

Rest API

def api_gateway(request):
    if not [1](request.user_id):
        return '429 Too Many Requests'
    # Continue processing

Drag options to blanks, or click blank then click option'

Acheck_rate_limit

Blog_request

Cvalidate_token

Dhandle_users_service

Attempts:

3 left

💡 Hint

Common Mistakes

Using authentication or logging functions instead of rate limiting.

Not passing the correct user identifier.

The function check_rate_limit should be called to verify if the user has exceeded allowed requests.

4fill in blank

hard

Fill both blanks to implement caching and logging in the API Gateway.

Rest API

def api_gateway(request):
    response = [1](request)
    [2](request, response)
    return response

Drag options to blanks, or click blank then click option'

Aget_cached_response

Blog_request_response

Cvalidate_token

Dhandle_users_service

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up caching and authentication functions.

Not logging after getting the response.

The API Gateway first tries to get a cached response with get_cached_response. Then it logs the request and response with log_request_response.

5fill in blank

hard

Fill all three blanks to implement request validation, routing, and error handling in the API Gateway.

Rest API

def api_gateway(request):
    if not [1](request):
        return '400 Bad Request'
    try:
        response = [2](request)
    except Exception:
        response = [3]()
    return response

Drag options to blanks, or click blank then click option'

Avalidate_request_schema

Broute_to_service

Chandle_error_response

Dlog_request

Attempts:

3 left

💡 Hint

Common Mistakes

Skipping request validation.

Not catching exceptions properly.

Using logging instead of error handling for exceptions.

The API Gateway first validates the request schema with validate_request_schema. Then it routes the request with route_to_service. If an error occurs, it returns a handled error response with handle_error_response.