Can't read a google static map via HtmlUnit

Question

I am trying to read a static map from Google Maps on the following URL.

This works fine from my web browser, but when I try this from HtmlUnit I get an UnexpectedPage result. Does anyone know what this means?

Answer 1

According to the javadoc of UnexpectedPage, you're receiving an UnexpectedPage because server returns an unexpected content type. If you check the returned header in HtmlUnit you can see that it contains: Content-Type=image/png

Here's a little application that retrieves an image from an URL:

import java.awt.Image;
import java.io.IOException;
import java.io.InputStream;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

import com.gargoylesoftware.htmlunit.UnexpectedPage;
import com.gargoylesoftware.htmlunit.WebClient;

/** Small test application used to fetch a map. */
public class FetchMapSwingApp extends JFrame {
   /** Serial Id. */
   private static final long serialVersionUID = 1920071939468904323L;

   /**
    * Default constructor.
    */
   public FetchMapSwingApp() {
      // Make sure the application closes correctly
      setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

      // The map where trying to read
      String url = "http://maps.googleapis.com/maps/api/staticmap?center=55.690815,12.560678&zoom=15&size=400x500&sensor=false";
      // Fetch the image
      Image image = fetchMap(url);

      // Add the image to the JFrame and resize the frame.
      add(new JLabel(new ImageIcon(image)));
      pack();
   }

   /**
    * Fetch the image on the given URL.
    * 
    * @param url
    *            the image location
    * @return the fetched image
    */
   private Image fetchMap(String url) {
      Image image = null;
      WebClient webClient = new WebClient();
      webClient.setThrowExceptionOnScriptError(false);

      try {
         // The URL returns a png file!
         UnexpectedPage page = webClient.getPage(url);
         InputStream inputStream = page.getInputStream();
         // Read the stream to an image
         image = ImageIO.read(inputStream);
      } catch (IOException e) {
         e.printStackTrace();
      }

      return image;
   }

   /**
    * Start of the application.
    * 
    * @param args
    *            the arguments to the main method
    */
   public static void main(String args[]) {
      java.awt.EventQueue.invokeLater(new Runnable() {
         @Override
         public void run() {
            new FetchMapSwingApp().setVisible(true);
         }
      });
   }
}