Download an image with JS?

I´m trying to download an image from an URL with Javascript using socket.

My first problem was separating the header from the body. I do it by reading line by line and if the line starts with "\n" then it seams to be the body.

A problem with this is that it´s very very slow. Reading a 1x1 pixel png takes 5-10 seconds.

The stranger thing is that I can´t write the content to file. I can write a string to a file, but not the body of the image, toString() doesn´t seem to help.

Anyone with experience or advice?

var img_data = "";

var line;

var body_start = false;

var conn = new Socket;

if (conn.open ("www.test.com:80", "BINARY")) {

var request = "GET /phoenix/images/5_topnavlogo.jpg HTTP/1.1\n" +

  "Host: www.test.com\n" +

  "User-Agent: InDesign ExtendScript\n" +

  "Accept: text/xml,text/*,*/*\n" +

  "Accept-Encoding:\n" +

  "Content-Length: 0\r\n" +

  "Content-Type: application/x-www-form-urlencoded\r\n" +

  "Connection: keep-alive\n" +

  "Accept-Language: *\n" +

  "Accept-Charset: utf-8\n" +

  "\n";

conn.write(request);

while(!conn.eof) {

line = conn.readln(255);

if(line.substring(0, 1) == "\n") {

img_data = line.substring(1);

}

}

conn.close();

alert(img_data);

var img_file = new File(File(app.activeScript).parent + '/test.txt');

img_file.open('w');

img_file.write(img_data);

img_file.close();

alert("Done");

}