How to Properly Close an HTTP Request for Background Processing?

Properly Closing an HTTP Request for Background Processing

In HTTP requests, it is often desirable to respond immediately while processing the request payload in the background. This is achieved by acknowledging the request with a 202 Accepted status code, allowing clients to continue without waiting for the completion of the background task.

Responding with 202 Accepted

To properly handle such requests, it is crucial to close the request after sending the 202 Accepted header. This is because returning from the handler signifies the completion of the request. Therefore, it is recommended to explicitly close the request before starting the background task:

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

Responding with 200 OK

When responding with 200 OK, it is sufficient to return from the handler, as the HTTP headers will be automatically set to indicate a successful response.

<code class="golang">func index(w http.ResponseWriter, r *http.Request) {
    go sleep()
    return // Close the request
}</code>

Caution

It is important to note that the HTTP request and response values should not be used in the background goroutine after the request is closed, as they may be reused.

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