This article details a distributed Redis-based solution for enforcing multiple rate-limiting rules simultaneously (e.g., 10 requests per minute and 20 per two minutes) while preventing duplicate submissions, using Zset data structures, Lua scripts for atomicity, and Spring AOP annotations.
This article outlines essential backend best practices for integrating WeChat Pay v2, covering correct handling of order amounts, trade type fields, second signatures, merchant binding, currency units, duplicate consumption prevention, payment result verification, non‑transactional operation logging, and the unified order API.
This article explains how to prevent duplicate API calls and achieve idempotency in Spring Boot 3.0.5 by using unique tokens, timestamps, or Spring AOP, and provides complete code examples for custom annotations, AOP aspects, interceptors, and Redis‑based token management.
To prevent storing duplicate remote images on a PHP server, this guide explains two techniques—generating a unique filename from the image URL or from the image content using MD5 hashing—along with complete PHP code examples that check for existing files before saving.
