How to Properly Close an HTTP Request for Background Processing in Go?

How to Properly Close a Request for Background Processing

Introduction

When responding to HTTP requests, you may need to process the payload in the background while responding with a non-blocking response. This can be achieved by closing the request and starting a goroutine to continue processing.

Response Closure with 202 Accepted

In the code sample provided, you set the status code to 202 Accepted to indicate that the request is accepted for background processing. To properly close the request, you can simply write the header and start the goroutine, as shown below:

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

Returning from Request Handler

Some developers recommend returning from the request handler after writing the header and starting the goroutine. However, this is not necessary and can be omitted. Returning from the handler automatically signals the request's completion and releases the resources allocated to it.

HTTP Status 200 OK

If you intend to return a 200 OK status code, you can simply call the sleep function without setting the status code. If no headers are set, 200 OK will be set automatically by the server.

Best Practice

The best practice for closing a request for background processing is to write the header and start the goroutine, as demonstrated in the following code:

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

Remember to avoid using the http.ResponseWriter or httpRequest values in the concurrent goroutine after returning from the handler, as they may be reused by the server.

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