How to send/receive binary stream on android

Android 2.2 SDK:
　　AndroidHttpClient client = AndroidHttpClient.newInstance("UserAgent");
　　try { 
  　　 HttpPost post = new HttpPost( "yoururl" );      
  　　 post.setEntity(new ByteArrayEntity( Node.toByteArray(this.node)));  
  　　 HttpResponse response = client.execute(post);
 　　  if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {   
 　　   // receive
 　　   byte[] buffer = EntityUtils.toByteArray(response.getEntity()); 
　　    
 　　  }
　　  } catch (Throwable e) {
　　   System.out.println( "http error: " + e.getMessage() );
　　  }finally {
   　　      if (client != null) {
    　　      client.close();              
     　　    }
     　　}

　　　AndroidHttpClient is new api on 2.2

Below the 2.2 SDK:
      HttpParams params = new BasicHttpParams();
      HttpProtocolParams.setVersion( params, HttpVersion.HTTP_1_1);
      HttpProtocolParams.setContentCharset( params, HTTP.UTF_8); 
      DefaultHttpClient client =  new DefaultHttpClient( params );
 　　try { 
  　　 HttpPost post = new HttpPost( "yoururl" );          
   　　post.setEntity(new ByteArrayEntity( Node.toByteArray(this.node)));  
   　　HttpResponse response = client.execute(post);
  　　 if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { 
   　　 // receive  
   　　 byte[] buffer = EntityUtils.toByteArray(response.getEntity()); 
  　　 }
  　　} catch (Throwable e) {
 　　 　　 System.out.println( "http error: " + e.getMessage() );
 　　 }finally {
      　　   if (client != null) { 
   　　 client.getConnectionManager().shutdown();
            
       　　  }
    　 }

Notice: this use http 1.1 protocal version, if you set post.setHeader(new BasicHeader("Content-Length", ""+ totalSize)), you will fail to send sometimes,
It's better to determine by system;