UnityWebRequest POST to PHP not work

Question

I use documentation with WWWForm: https://docs.unity3d.com/Manual/UnityWebRequest-SendingForm.html

C#:

void Start() {
    StartCoroutine(Upload());
}         


        

Answer 1

I tried all of the above answers and nothing worked, but I noticedd that Unity adds a Request Header :

upgrade-insecure-requests  1

So I upgraded my url to https://

It still didn't work with MultipartFormData, but it started working with WWWForm form = new WWWForm();