Java APIs

public static void main(String[] args) 
	{
		InputStream is;
		String[] mess = {"<?xml version=\"1.0\" encoding=\"utf-8\"?>",
				"<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">",
				"<soap:Body>",
				"<GetSlideData xmlns=\"http://tempuri.org/\" />",
				"</soap:Body>",
				"</soap:Envelope>"};

		try {
			URL url = new URL("http://localhost:4351/SlideService/Service.asmx?op=GetSlideData");
			HttpURLConnection urlcon = (HttpURLConnection)url.openConnection();
			
			urlcon.setRequestMethod("POST");
			urlcon.setDoOutput( true );
			urlcon.connect();
			OutputStream out = urlcon.getOutputStream();
			for(int i = 0; i < mess.length; i++)
			{
				for(int j = 0; j < mess.length(); j++)

					out.write((int)mess[i].charAt(j));

			}

			out.close();

			urlcon.toString();

			is = urlcon.getInputStream();

			System.out.println("ContentType: " + urlcon.getContentType());

			

		} 

catch (Exception e)

{

			

			e.printStackTrace();

		}

	}
When I start this program i get a:

Server returned HTTP response code: 415 for URL: http://localhost:4351/SlideService/Service.asmx?op=GetSlideData

The request should look like this:
POST /SlideService/Service.asmx HTTP/1.1

Host: localhost

Content-Type: text/xml; charset=utf-8

Content-Length: length

SOAPAction: "http://tempuri.org/GetSlideData"



<?xml version="1.0" encoding="utf-8"?>

<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">

<soap:Body>

<GetSlideData xmlns="http://tempuri.org/" />

</soap:Body>

</soap:Envelope>
I'm looking for a tool or a way to see the http request, that the application does send.
Does someone have an idea how to do this?

Kind regards,
ClaudeMichelle