Ryota-Blog

A pass report for the JSTQB Foundation Level (CTFL) after 1.5 months of studying. Covers the textbook and free app I used, my generative-AI study method — building a question-authoring engine with Claude Code and drilling 535 questions — and how to check your pass/fail result online.

A step-by-step guide to applying a custom SSL/TLS certificate (issued by a CA of your choice) to an AWS Amplify Hosting custom domain. Covers CSR creation, chain construction, integrity verification, Terraform configuration, post-deployment verification, and expiry monitoring — written so junior engineers can follow along.

Complete solution guide for CloudFront + Next.js image optimization error. Solve "url parameter is not allowed" error with AllViewerExceptHostHeader policy, detailed debugging steps, and implementation examples for AWS App Runner integration.

May 2025 Ryota-Blog release notes covering internationalization (i18n) implementation, code block enhancements, LLMs integration, SEO optimization, and major infrastructure updates for improved performance and user experience.