Hi,
The response of the first request contains the header
"access-control-allow-origin: *". This is known as Cross-Origin Resource
Sharing ( see http://www.w3.org/TR/cors/ ) and allows to call other domain
with XHR.
Be careful, not all browser support this feature.
Alexandre
2012/7/24 KutaBeach <koktebelnig...@gmail.com>
> Greetings!
>
> Gentlemen, please help me to understand one GWT feauture.
>
> I have the following code:
>
>> RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, newsUrl);
>> try {
>> Request response = builder.sendRequest(null, new
>> RequestCallback() {
>> @Override
>> public void onResponseReceived(Request request, Response
>> response) {
>> Window.alert("RESPONSE: " + response.getText() + "
>> STATUS CODE:" + response.getStatusText());
>> }
>> @Override
>> public void onError(Request request, Throwable exception)
>> {
>> Window.alert("ERROR: " + exception.getMessage());
>> }
>> });
>> } catch (RequestException e) {
>> Window.alert("ERROR: " + e.getMessage());
>> }
>
>
> I thought that this code should produce a simple ajax get request to the
> url specified, and if the domain of target url does not coincide with
> domain of my app - it should return error or nothing.
>
> But in fact, it works in the following way:
> - if target url contains json it returns that json:
> url example:
> http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20csv%20where%20url%3D'http%3A%2F%2Fdownload.finance.yahoo.com%2Fd%2Fquotes.csv%3Fs%3DINFY.BO%2CRELIANCE.NS%2CTCS.BO%26f%3Dsl1d1t1c1ohgv%26e%3D.csv'%20and%20columns%3D'symbol%2Cprice%2Cdate%2Ctime%2Cchange%2Ccol1%2Chigh%2Clow%2Ccol2'&format=json<http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20csv%20where%20url%3D%27http%3A%2F%2Fdownload.finance.yahoo.com%2Fd%2Fquotes.csv%3Fs%3DINFY.BO%2CRELIANCE.NS%2CTCS.BO%26f%3Dsl1d1t1c1ohgv%26e%3D.csv%27%20and%20columns%3D%27symbol%2Cprice%2Cdate%2Ctime%2Cchange%2Ccol1%2Chigh%2Clow%2Ccol2%27&format=json>
> MessageBox with json response is shown.
> The request is marked as OK in Chrome -> Developer Tools -> Network.
>
> - if target url is a simple site url (for example:
> http://edition.cnn.com/) - it returns nothing, no response at all, no
> error.
> Empty Message box in OnSuccess handler is shown.
> The request is marked as Canceled in Chrome.
>
> So whats going on?
> I thought I can reach other sites only if I use JsonRequestBuilder,
> because instead of sending get request directly it will manually create
> script elements on the page.
> Does simple RequestBuilder also create script elements all the time?
> If no, then why first request is working?
> If yes, then why the second request is cancelled?
>
> GWT 2.4, Chrome 19.0 or FF 13, Development Mode.
>
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