one marks

1. Containers are lightweight, portable, and self-sufficient units that package applications and their dependencies, allowing them to run consistently across different computing environments.
2. Common methods used in REST APIs include GET, POST, PUT, PATCH, DELETE.
3. A resource in a RESTful API can be any entity or object, such as users, orders, or products.
4. In REST, resources are typically identified by URIs (Uniform Resource Identifiers).
5. GET HTTP method is commonly used to retrieve a resource.
6. A parent-child relationship exists between /users/123/orders and /users/123.
7. Example of an API endpoint: https://api.example.com/v1/users/123.
8. Two advantages of SOA (Service-Oriented Architecture):
   • Reusability: Services can be reused across multiple applications.
   • Scalability: Services can be independently scaled based on demand.
9. In a URL like GET /users?age=25, age is a query parameter.
10. PUT HTTP method is idempotent and used to update a resource.
11. The WebSocket API allows real-time bidirectional communication between the client and the server.
12. The REST architectural pattern follows the principle where each resource has its own URL and is accessed using HTTP.

2MArks

1. What are the three common types of parameters in an API request?

   • Path Parameters: Used to identify a specific resource in the URL.
   • Query Parameters: Used to filter or modify the request, typically included in the URL after a ?.
   • Header Parameters: Used for metadata such as authentication tokens, content type, or API versioning.

2. How do path parameters differ from query parameters in an API request?

   • Path Parameters: Define a specific resource and are part of the URL (e.g., /users/{id}).
   • Query Parameters: Used to filter, sort, or modify a request and are appended to the URL after a ? (e.g., /users?id=123).

3. Differentiate between REST API and GraphQL API.

   • REST API: Uses multiple endpoints for different resources, relies on HTTP methods, and often returns fixed data structures.
   • GraphQL API: Uses a single endpoint where clients specify the exact data they need, reducing over-fetching and under-fetching.

4. Describe the features of WebSocket.

   • Full-duplex communication
   • Persistent connection
   • Low-latency data transmission
   • Suitable for real-time applications like chat apps, live notifications, and stock price updates

5. What is the primary advantage of SOAP APIs over REST?

   • SOAP APIs provide built-in security (WS-Security) and transactional reliability, making them suitable for financial and enterprise applications.