Requirements

Functional Requirements:

• Create a short URL for a given long URL.
• Return the long URL associated with a given short URL.

Non-Functional Requirements:

• High Availability（高可用） - Low Latency（redirect < 10ms） - Scalability（讀多寫少，100:1） - Durability（資料不能遺失）

API Design

POST /api/v1/urls Body: { long_url: "https://..." } Response: { short_url: "https://short.io/abc123" } GET /{short_url} Response: 302 Redirect → long_url

High-Level Design

Describe the overall system architecture. Identify the main components needed to solve the problem end-to-end. Use the diagramming tool to create a block diagram.

Detailed Component Design

Deep dive into 2-3 key components. Explain how they work, how they scale, discuss tradeoffs, capacity, and any relevant algorithms or data structures.