How to Properly Close HTTP Requests with 202 Accepted Status While Maintaining Background Processing in Go?

Properly Closing a Request While Continuing Background Processing

When responding to an HTTP request with a 202 Accepted status code, it's crucial to handle the closure of the request correctly to ensure that the payload can still be processed in the background.

Return Statement Sufficiency

When dealing with a request that needs to be closed, it's essential to return from the handler function to signal its completion. This is because, as per the http.Handler documentation, returning indicates that the request is finished and accessing the ResponseWriter or Request.Body concurrently or after returning is invalid.

Omitting the Final Return

Returning from the handler function is sufficient to close the request, so you can omit the final return statement altogether. In Go, execution exits a function when its last statement is executed, regardless of whether it's a return or not.

Minimal Code for 202 Accepted

If you only need to return a 202 Accepted status code and continue processing in the background, the following minimal code is sufficient:

<code class="go">func index(w http.ResponseWriter, r *http.Request) {
    w.WriteHeader(http.StatusAccepted)
    go sleep()
}</code>

Precaution with Concurrent Usage

Remember that accessing the ResponseWriter or http.Request values in the concurrent goroutine after returning from the handler is unsafe as they may be reused.

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