"Empty reply from server" for long-running task in http handler

Hey folks, I have a quick question. I have a very straightforward endpoint that triggers some long-running action in my web service (re-ordering files on the filesystem), let’s imagine it takes 10-15 seconds:

func rebuildHandler(appcfg *cfg.Config) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

         // emulate workload
        time.Sleep(10 * time.Second)

        // no errors returned
        w.Header().Set("Content-Type", "application/text")

when I trigger this endpoint with curl

curl -i "http://localhost:8080/rebuild"

it says “curl: (52) Empty reply from server” If there are fewer files (< 1Gb), and the re-ordering performs faster (0-5 seconds) - the server replies with 200 OK.

Does it depend on the client? Are there any chances to make the client wait for the reply?
ps. I tried --connect-timeout in curl, but no luck


net.http.Server.WriteTimeout maybe?

Thank you, Jeff!
Initially, this parameter was set (by myself) to the low value!

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