upload image with data to server Titanium

i have some data i need to upload it to the server with an image using multipart/form-data but i getting request time out this is my data

var data={
           property_name:p_n_txt.value,
           friendly_name:f_txt.value,
           property_type:clicked,
           size:space_Slider.getValue(),
           price:price_Slider.getValue(),
           number_of_bedrooms:bedrooms_Slider.getValue(),
           number_of_bathrooms:bathrooms_Slider.getValue(),
           number_of_parkings:p_space_Slider.getValue(),
           location:a_txt.value,
           features:13,
           payment_method:4,
           image1_name:"image0.png",
           image1:Ti.Filesystem.getFile(Ti.Filesystem.tempDirectory,Ti.App.Properties.getString("filename")),
 
       };

var xhr = Ti.Network.createHTTPClient({
        onload: function() {
        var myData = JSON.parse(this.responseText);
        console.log(this.responseText);
 
 
        },
        // function called when an error occurs, including a timeout
        onerror : function(e) {
        Ti.API.debug(e.error);
        console.log(this.status);
        console.log(e.error);
 
        },
        timeout : 20000
        });
 
        xhr.open('POST','http://url/');
        xhr.setRequestHeader("enctype", "multipart/form-data");
         xhr.setRequestHeader("Content-Type", "image/png");
         // xhr.setRequestHeader("Content-Type", "image/jpeg");
 
        xhr.send(data);
 
 
    });

but i have 4 cases i tried with them

first :with stringify i got HTTP 415 if i added contentType "image/png" and HTTP 500 if i didn't added

second without stringify when i add added contentType "image/png" i got request time out and when i didn't add it i get HTTP 413

any idea on how to accomplish this cause i found many question about it but no one was helpful for me thanks