<ul data-eligibleForWebStory="true"><li>Spring Boot serves files by default from classpath folders like static, public, resources, and META-INF/resources without explicit controller code.</li><li>When serving files outside these folders, you need to specify the location using a property or WebMvcConfigurer.</li><li>Handling custom images involves mapping a controller route to a physical file path and checking its existence.</li><li>For large files, streaming directly from disk is advised to avoid memory strain.</li><li>Proper MIME type detection is crucial for browsers to display images correctly.</li><li>Preventing traversal attacks involves building the path from a fixed directory, normalizing it, and checking permissions.</li><li>Using API keys for file access separation between trusted requests and random traffic is recommended.</li><li>Authentication and permission checks are necessary when files are user-specific.</li><li>Caching strategies should be tailored based on the sensitivity of the content being served.</li><li>Control over file serving allows for customized handling of requests and content delivery.</li></ul>

Serving Images Outside the Static Folder in Spring Boot

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