Calling an web service from java program

I am trying to call an web service by sending an xml file as input and i should be receiving an xml as a reply but whenever i send the xml i get proxy authentication error so i thought i was sending the wrong xml but the same xml works fine when i use SOAP UI so i guess there is some problem with my code.

Here is the code below

URL url = null;

   String strUrl="<soapenv:Envelope xmlns:soapenv=\"http://ift.tt/1bLnMDr\" xmlns:soap=\"SoapAuthenticator\" xmlns:ship=\"http://ift.tt/1zznUkv\"><soapenv:Header> <soap:ServiceAuthenticationHeader><soap:Username>TDC43671</soap:Username> <soap:Password>hTiNMft/KaMfDDD</soap:Password><soap:IsEncrypted>false</soap:IsEncrypted></soap:ServiceAuthenticationHeader></soapenv:Header><soapenv:Body><ship:SearchForDropPoints><ship:productConceptID>92</ship:productConceptID><ship:installationID>00000000018</ship:installationID><ship:country>DK</ship:country><ship:address></ship:address><ship:postCode>6000</ship:postCode><ship:city></ship:city><ship:limit>5</ship:limit></ship:SearchForDropPoints></soapenv:Body></soapenv:Envelope>";

String ss="http://ift.tt/175o3W6";

url = new URL(ss);

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setDoOutput(true);
 conn.setDoInput(true);
conn.setRequestProperty("Content-type", "text/xml");
  conn.setRequestProperty("Accept", "text/xml, application/xml");
  conn.setRequestMethod("POST");

conn.connect();

OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());

   wr.write(strUrl);
   wr.flush();
   wr.close();


   int iHttpResponseCode = conn.getResponseCode();
  String  strErrorMessage = conn.getResponseMessage();

  System.out.println("Getting Response status");
  System.out.println(iHttpResponseCode);

  System.out.println(strErrorMessage);

Can anybode help me as to where i am going wrong.