This article elaborates on the definition, dangers, and prevalence of resource leaks in Go, pointing out that unclosed resources like files, network connections, HTTP response bodies, and database query results can lead to memory exhaustion, system limits, performance degradation, and even application crashes. It emphasizes that Go's garbage collector cannot manage external resources, necessitating explicit closure. The article offers three key methods to prevent resource leaks: using `defer` statements to ensure timely resource closure, conducting load tests to uncover leaks under high pressure, and leveraging static code analysis tools. Through two detailed case studies (HTTP response body leaks and unclosed SQL `rows`), the article vividly illustrates how a single missing `Close()` call can lead to system failure. Finally, it highlights GoLand 2025.3's new real-time resource leak analysis feature, stressing its ability to help developers identify and fix issues from the coding stage, thereby enhancing the reliability and maintainability of Go applications.






