Beginner LevelREST APIs & Web Services
What is HATEOAS (Hypermedia As The Engine Of Application State)?
❓ Interview Prompt: Explain HATEOAS, Richardson Maturity Model Level 3, self-descriptive hypermedia links (`_links`), and HAL specification.
HATEOAS is the highest level (Level 3) of the Richardson Maturity Model for REST APIs:
Core Concept:
A client interacts with a REST API entirely through dynamic hypermedia links provided dynamically by the server in response payloads, eliminating hardcoded client URIs!
Code Implementation Example
json
{
"id": 42,
"status": "PENDING",
"amount": 99.99,
"_links": {
"self": { "href": "/api/v1/orders/42" },
"cancel": { "href": "/api/v1/orders/42/cancel", "method": "POST" },
"payment": { "href": "/api/v1/orders/42/pay", "method": "POST" }
}
}💡HATEOAS JSON payload containing HAL hypermedia navigation links.
🎯 Interview Key Takeaway
HATEOAS embeds hypermedia links inside JSON payloads, allowing clients to dynamically discover available resource actions.
#HATEOAS#HAL#REST Architecture#Beginner
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