414 Request-URI Too Large 414 HTTP/1.1

Hi, i get Request-URI Too Large on image upload request

The image is in base 64, I already upload other images without errors

The length of string in base64 is 26667

Complete message:

{414 Request-URI Too Large 414 HTTP/1.1 1 1 map[Content-Type:[text/html] Date:[Mon, 03 Dec 2018 06:08:27 GMT] Server:[cloudinary] Content-Length:[186] Connection:[keep-alive]]

Im upload from golang, the code is:

req, err := http.NewRequest("POST", "https://api.cloudinary.com/v1_1/xperiafan13/image/upload", nil)
q := req.URL.Query()
q.Add("timestamp", fmt.Sprintf("%d", now.Unix()))
q.Add("public_id", file)
q.Add("api_key", "67xxxxxxxx")
q.Add("file", b64)
q.Add("signature", sign)
req.URL.RawQuery = q.Encode()
if err != nil {
   fmt.Println(err.Error())
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

resp, err := http.DefaultClient.Do(req)

if err != nil {
   fmt.Println(err.Error())
}

defer resp.Body.Close()

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