feat: add assignment 3

[Chibey-max]

JSON-RPC 2.0 Specification

A lightweight, stateless remote procedure call (RPC) protocol encoded in JSON.

Core Concepts

• Transport Independent: Works over HTTP, WebSockets, or TCP.

• Stateless: No session data is persisted between requests.

• Bidirectional: Supports client-to-server and server-to-client calls.

---

📩 Message Structures

1. Request

JSON

{
  "jsonrpc": "2.0",
  "method": "subtract",
  "params": [42, 23],
  "id": 1
}

2. Success Response

JSON

{
  "jsonrpc": "2.0",
  "result": 19,
  "id": 1
}

3. Error Response

JSON

{
  "jsonrpc": "2.0",
  "error": { "code": -32601, "message": "Method not found" },
  "id": 1
}

---

🛠 Interaction Types

• Standard: Request with an id expects a Response.

• Notification: Request without an id. No response is sent.

• Batch: An array of requests sent together; handled for efficiency.

---

⚠️ Standard Error Codes

Code | Definition -- | -- -32700 | Parse error (Invalid JSON) -32600 | Invalid Request object -32601 | Method not found -32602 | Invalid parameters -32603 | Internal server error