Can I use GWT HTTP request to read a text file from a website?

Question

I have created a GWT Starter Project and I wanted to use an HTTP Request to read a text file from another site.

I put this code in the entry point method onModuleLoad():

String url = "http://www.textfiles.com/100/apples.txt";
RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, url);

try {
    Request myrequest = builder.sendRequest(null, new RequestCallback() {

        public void onError(Request request, Throwable exception) {
        // Couldn't connect to server (could be
        // timeout, SOP violation, etc.)
        }
        public void onResponseReceived(Request request, Response response) {
            if (200 == response.getStatusCode()) {
                Label l = new Label();
                l.setText("Response: " + response.getText());
                RootPanel.get().add(l);
            }
            else {
                // Handle the error. Can get the status
                // text from response.getStatusText()
                Label l = new Label();
                l.setText("Error. getText() = " + response.getText() 
                    + " Status text = "
                    + response.getStatusText()
                    + ". Code: "
                    + response.getStatusCode());
                RootPanel.get().add(l);
            }
        }
    });
}
catch (RequestException e) {
    // Couldn't connect to server
}

The error block is always executed and response.getStatusCode() is 0. response.getText() and response.getStatusText() return blank text. Can GWT HTTP Request be used to read text files, or should I use another method?

Are you making a request to a different domain?

Fedy2
– Fedy2

2013-08-01 20:30:57 +00:00
Commented Aug 1, 2013 at 20:30 — Fedy2
– Fedy2, Commented Aug 1, 2013 at 20:30
@Fedy2 Yes, I've tried other sites but get the same result.

badjr
– badjr

2013-08-01 20:50:23 +00:00
Commented Aug 1, 2013 at 20:50 — badjr
– badjr, Commented Aug 1, 2013 at 20:50

Marconius · Accepted Answer · 2013-08-01 21:12:14Z

3

You cannot make HTTP requests to different domains because of the Same Origin Policy.

answered Aug 1, 2013 at 21:12

Marconius

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