El host de destino no debe ser nulo o configurado en parameters.scheme = null, host = null

I get get la siguiente excepción:

Target host must not be null or set in parameters.scheme=null, host=null,path=/webservices/tempconvert.asmx/FahrenheitToCelsius 

Mi código fuente:

 public class ParActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView t=new TextView(this); String encodedUrl = null; // setContentView(R.layout.main); HttpClient client = new DefaultHttpClient(); //String query = "?Fahrenheit=26"; // String host = "www.w3schools.com/webservices/tempconvert.asmx/"; // encodedUrl = host + URLEncoder.encode(query,"utf-8"); // int p=(Integer) null; // URI uri = URIUtils.createURI("vv", "www.w3schools.com", 50, "/webservices/tempconvert.asmx", "?Fahrenheit=26", null); try{ String postURL = "/webservices/tempconvert.asmx/FahrenheitToCelsius"; HttpPost post = new HttpPost(postURL); // post.addHeader("scheme","vv"); // post.setHeader("host", "www.w3schools.com"); String PostData="36"; StringEntity httpPostEntity = new StringEntity(PostData, HTTP.UTF_8); post.setEntity(httpPostEntity); post.setHeader("host", "www.w3schools.com"); post.setHeader("Content-Length", new Integer(PostData.length()).toString()); post.setHeader("Content-Type", "application/x-www-form-urlencoded"); List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2); // nameValuePairs.add(new BasicNameValuePair("host", "www.w3schools.com")); nameValuePairs.add(new BasicNameValuePair("Fahrenheit", "26")); post.setEntity(new UrlEncodedFormEntity(nameValuePairs)); HttpResponse responsePOST = null; // Execute HTTP Post Request // HttpResponse response = httpclient.execute(post); client.getConnectionManager(); responsePOST = client.execute(post); HttpEntity resEntity = responsePOST.getEntity(); String response=EntityUtils.toString(resEntity); response=response.trim(); // Log.i("RESPONSE=",response); t.setText("response"+response); setContentView(t); } catch (Exception e) { // TODO Auto-generated catch block //e.printStackTrace(); t.setText("ex"+e.getMessage()); setContentView(t); } } } 

Quiero invocar el webservice en: http://www.w3schools.com/webservices/tempconvert.asmx?op=CelsiusToFahrenheit

Usando HttpClient. ¿Cómo debo dar el anfitrión y el esquema como entrada?

por favor ayuda…

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