Where Should 'defer req.Body.Close()' Be Placed in Go HTTP Handlers?

Placement of "defer req.Body.Close()" in HTTP Handlers

When working with HTTP handlers in Golang's net/http package, developers often encounter the question of where to place the statement "defer req.Body.Close()" to ensure proper resource handling. In this article, we will explore the correct placement and delve into its implications.

It's important to understand that an HTTP request body doesn't need to be closed explicitly within the handler. According to the documentation for http.Request:

// The Server will close the request body. The ServeHTTP
// Handler does not need to.

This means that the responsibility of closing the request body lies with the server and not the handler itself. Therefore, placing "defer req.Body.Close()" in the handler is unnecessary and does not affect the behavior of the server in any meaningful way.

Consequently, the placement of this defer statement within the function is irrelevant. Whether it's placed at the beginning or the end, it serves no purpose. It's best to omit it entirely to avoid confusion and prevent unnecessary resource consumption.

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