Nginx Redirect Trap: How to Fix Incorrectly Encoded Ampersands ('&') in URLs?

Have you ever encountered an issue where the ampersand ('&') in a URL query string gets unexpectedly encoded to '%26' during an Nginx 301 redirect? This article from wiki.lib00.com delves into the root cause of this problem and provides comprehensive solutions, from basic `if` statement fixes to the best practice of using the `map` directive, helping you resolve URL encoding issues in Nginx redirects for good.