Post não retorna a página esperada

Olá,
Utilizo AIDE (Android IDE) para criar aplicativos Android.
Montei o post conforme o código abaixo mas o site retorna a mesma página, o que estou fazendo de errado?

private class PutMethodDemo extends AsyncTask<String , Void ,String>
{
	String server_response;
	HttpResponse response;
	String server_content = null;

	@Override
	protected String doInBackground(String... strings) {

		HttpClient client = new DefaultHttpClient();
		HttpPost post = new HttpPost("http://www.consuladoportugalrjservicos.com/public_html/exec");

		List<NameValuePair> pairs = new ArrayList<NameValuePair>();
					
		 pairs.add(new BasicNameValuePair("modulo", "modulo.login"));
		 pairs.add(new BasicNameValuePair("acao", "login101"));
		 pairs.add(new BasicNameValuePair("txtcpf", "02355180776"));
		 pairs.add(new BasicNameValuePair("txtusuario","acastanheira2001@yahoo.com.br"));
		 pairs.add(new BasicNameValuePair("txtsenha", "senha_do_usuario"));
 

		try
		{
			post.setEntity(new UrlEncodedFormEntity(pairs));
		}
		catch (UnsupportedEncodingException e)
		{
			e.printStackTrace();

		}

		try
		{
			response = client.execute(post);
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		
		Log.e("Response", "" + response.toString());

		HttpEntity httpEntity = response.getEntity();
		
		try
		{
			server_content = readStream(httpEntity.getContent());
		}
		catch (UnsupportedOperationException e)
		{
			e.printStackTrace();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}

		return null;
	}

	@Override
	protected void onPostExecute(String s) {
		super.onPostExecute(s);

		//final TextView textView1 = (TextView) findViewById(R.id.mainTextView1);
		//textView1.setText(server_content);
		
		//final EditText edittext1 = (EditText) findViewById(R.id.mainEditText1);
		//edittext1.setText(server_content);
		
		WebView myWebView = (WebView) findViewById(R.id.webview);
        myWebView.loadData(server_content, "text/html", null);
		

		Log.e("Response", "" + server_response);
		Log.v("Response", "" + s);


	}

// Converting InputStream to String

	private String readStream(InputStream in) {
		BufferedReader reader = null;
		StringBuffer response = new StringBuffer();
		try {
			reader = new BufferedReader(new InputStreamReader(in));
			String line = "";
			while ((line = reader.readLine()) != null) {
				response.append(line);
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (reader != null) {
				try {
					reader.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return response.toString();
	}



}