Uploading an image using HttpUrlConnection

I am trying to upload an image from my device file system to a server. The upload works fine when i use a WIFI connection, but fails when on GPRS. My code is as below:

String request=null;
byte[] attachmentData;
//read the image from the 开发者_运维知识库file system
attachmentData=bytesReadfromthefilesystem; 
//I use Apache's Base64 encoding to convert the byte array to string    
 request=Base64.encode(data);

  URL url = new URL(
        "http://mydomain.com:9090//abc/http?ID=12345");
        HttpURLConnection  httpURLConnection = (HttpURLConnection) url
            .openConnection();
    httpURLConnection.setRequestProperty("Content-Type",
            "text/plain");
    httpURLConnection.setRequestMethod("POST");
    httpURLConnection.setDoOutput(true);
    httpURLConnection.setChunkedStreamingMode(0);
    httpURLConnection.connect();
    OutputStream outStream outStream =httpURLConnection.getOutputStream();
    if (outStream != null) {
            if (request.getData().length() > 0) {
                outStream.write(request.getBytes());
            }

            outStream.flush();
            outStream.close();
            outStream = null;      
      }

The image size is close to 1MB. I am trying on Samsung Galaxy Pop (Android 2.2.1). I do not get any errors too. Am i missing out on something here? Could someone kindly help me with this? Thanks in advance.

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did you set the permission on your AndroidManifest file?

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>

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Try to setConnectionTimeout() to 300000 (5 minutes) or something like that.