(Java) Explaining the Rest ClearResponseBodyStream Method

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkRest rest = new CkRest();

    // Connect to the web server
    boolean bTls = true;
    int port = 443;
    boolean bAutoReconnect = true;
    boolean success = rest.Connect("www.chilkatsoft.com",port,bTls,bAutoReconnect);
    if (success != true) {
        System.out.println(rest.lastErrorText());
        return;
        }

    // Setup a file stream for the download
    CkStream fileStream = new CkStream();
    fileStream.put_SinkFile("qa_output/starfish.jpg");

    // Indicate that the call to FullRequestNoBody should send the response body
    // to fileStream if the response status code is 200.
    // If a non-success response status code is received, then nothing
    // is streamed to the output file and the error response is returned by FullRequestNoBody.
    int expectedStatus = 200;
    rest.SetResponseBodyStream(expectedStatus,true,fileStream);

    String responseStr = rest.fullRequestNoBody("GET","/images/starfish.jpg");
    if (rest.get_LastMethodSuccess() == false) {
        // Examine the request/response to see what happened.
        System.out.println("response status code = " + rest.get_ResponseStatusCode());
        System.out.println("response status text = " + rest.responseStatusText());
        System.out.println("response header: " + rest.responseHeader());
        System.out.println("response body (if any): " + responseStr);
        System.out.println("---");
        System.out.println("LastRequestStartLine: " + rest.lastRequestStartLine());
        System.out.println("LastRequestHeader: " + rest.lastRequestHeader());
        return;
        }

    System.out.println("downloaded starfish.jpg");

    // Clear the response body stream previously set in the call to SetResponseBodyStream.
    rest.ClearResponseBodyStream();

    // Download something else, but this time send the response body to bd.
    CkBinData bd = new CkBinData();
    success = rest.FullRequestNoBodyBd("GET","/images/penguins.jpg",bd);
    if (success == false) {
        // Examine the request/response to see what happened.
        System.out.println("response status code = " + rest.get_ResponseStatusCode());
        System.out.println("response status text = " + rest.responseStatusText());
        System.out.println("response header: " + rest.responseHeader());
        System.out.println("response body (if any): " + bd.getString("utf-8"));
        System.out.println("---");
        System.out.println("LastRequestStartLine: " + rest.lastRequestStartLine());
        System.out.println("LastRequestHeader: " + rest.lastRequestHeader());
        return;
        }

    // Save the contents of bd to a file.
    success = bd.WriteFile("qa_output/penguins.jpg");

    System.out.println("Success: " + success);
  }
}