app_offline.htm explained from the ASP.NET Core Module source: the 503 it returns, where it goes, why it doesn't work, and a safe IIS deploy script.
Freelance web developer: Next JS, ASP NET Core, site speed and technical SEO. Real errors, real fixes.
Freelance web developer building fast, search-friendly websites for small businesses in the UK, US and Europe. I work with Next JS, React and ASP NET Core, and write about the real problems I hit: Core Web Vitals, caching, IndexNow, technical SEO. Original posts and free tools at knowledgemarkg.com
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