Go HTTP library is randomizing headers order

I've made Go code which sends http2 proxied request.

tlsConfig := &tls.Config{    MinVersion:         tls.VersionTLS12,    MaxVersion:         tls.VersionTLS13,    NextProtos:         []string{"h2", "http/1.1"},    ServerName:         u.Hostname(),    InsecureSkipVerify: true,    CipherSuites:       selectedCipherSuites,}proxyURL, _ := url.Parse("http://" + proxy)client := &http.Client{    Timeout: time.Second * 10,    Transport: &http.Transport{        Proxy: http.ProxyURL(proxyURL),        TLSClientConfig: tlsConfig,        ForceAttemptHTTP2: true,    },}

There is tls + ForceAttemptHTTP2, it sends http2 request to server. And in code it looks like this:

headers := req.Header   headers.Set("Accept",  acceptHeader)   headers.Set("Accept-Encoding", acceptEncoding)   headers.Set("X-Forwarded-For", ip)   headers.Set("Accept-Language", acceptLanguage)   headers.Set("Sec-Ch-Ua-Mobile",  "?0")   headers.Set("Sec-Ch-Ua-Platform",  "\"Windows\"")   headers.Set("Sec-Fetch-Dest",  "document")   headers.Set("Sec-Fetch-Mode",  "navigate")   headers.Set("Sec-Fetch-Site",  "none")   headers.Set("Sec-Fetch-User",  "?1")   headers.Set("Upgrade-Insecure-Requests", "1")   headers.Set("User-Agent",  userAgent)

So I want order of headers to be like this cause of bot detections that cdn's have, so they dont block me. But when I tested, I have received headers this way:

Connection: Keep-AliveAccept-Encoding: gzip, brX-Forwarded-Proto: httpsSec-Ch-Ua-Mobile: ?0User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0Upgrade-Insecure-Requests: 1Accept: text/htmlSec-Fetch-Dest: documentAccept-Language: bn-BD,bn;q=0.8Sec-Fetch-Mode: navigateSec-Fetch-Site: noneSec-Ch-Ua-Platform: "Windows"Sec-Fetch-User: ?1

So, it gets randomied, it's just one example, I recognized that every request it's different.And here is what exactly sends request.

    req, err := http.NewRequest(method, target, nil)    if err != nil {        log.Fatal("Error creating request:", err)    }

+

        response, err := client.Do(req)        if err != nil {            // fmt.Println("Došlo je do greške prilikom slanja zahteva:", err)            return        }        defer response.Body.Close()

I've tried everything that I could. Asked open ai to help but without any results.Also I've tried this https://go-review.googlesource.com/c/go/+/105755 but maybe it doesnt work for http2.

So, how to make order of headers to be in order which I wanted to be exactly while sending HTTP2 request with http/net library in Go, with TLS?