xmlHTTP POST请求

我查看了stackoverflow和google,但到目前为止还没有找到有效的解决方案。

https://ptsv2.com/ 测试上传。

这是我的代码:

var url = "https://corsanywhere.herokuapp.com/https://ptsv2.com/t/zuaco-1549007477/post";      

var base64Credentials = btoa(username+":"+password);

var xhttp = new XMLHttpRequest();
          var fd = new FormData();
          /* Add the file */ 
          fd.append("file", "img/1.png");

xhttp.open("POST", url, true);
xhttp.setRequestHeader("Authorization", "Basic " + base64Credentials);
xhttp.setRequestHeader("Content-Type", "image/png");
xhttp.send(fd);

   /* Check the response status */  
   xhttp.onreadystatechange = function() 
   {
      if (xhttp.readyState == 4 && xhttp.status == 200) 
      {
         console.log("UPLOAD SUCCESSFUL: " + xhttp.statusText);
         console.log("GET ALL: " + xhttp.getAllResponseHeaders());
      }
      else {
          console.log("UPLOAD FAILED!")
      }
   }