JSONP is a quite straight forward solution for the SOP problem and
thanks to the JsonpRequestBuilder nicely supported in GWT 2.1. But as
already mentioned the CGI service needs to be able to respond with
valid JSON data. Below some code example:
StringBuilder url = new StringBuilder(SERVICE_URL);
url.append("?
action=getAll").append("&userToken=").append(userMgr.getCurrentUserToken());
/*
* Resolving the data
*/
JsonpRequestBuilder jsonp = new JsonpRequestBuilder();
jsonp.setFailureCallbackParam("errorCallback");
jsonp.requestObject(url.toString(),
new AsyncCallback<JavaScriptObject>() {
@Override
public void onFailure(Throwable caught)
{
// some exception handling code
}
@Override
public void onSuccess(JavaScriptObject
result) {
/*
* Processing the provided JSON
Data
*/
something.buildFromJSON(new
JSONObject(
result));
}
});
HTH,
Lukasz
On 8 Dez., 14:46, bananos <[email protected]> wrote:
> Julio, you can try using JSONP, if your external CGI page is capable
> of returning valid JSON data.
> If it's not your case, the only possible way is to write server-side
> code at your backend, and serve data from your own host
>
> On Dec 8, 3:22 pm, julio <[email protected]> wrote:
>
>
>
>
>
>
>
> > Hi Thomas thanks for your reply.
>
> > > The "xs" linker only allows you to load the GWT app (*.nocache.js et
> > > al.) from a different origin than the "HTML host page". This is
> > > because the default linker ("std", or IFrameLinker) uses an iframe to
> > > load the *.cache.html and then hits the SOP when trying to communicate
> > > with the host page. The "xs" linker does not use an iframe but instead
> > > load *.cache.js files directly in the host page.
>
> > Ok so it's not my case.
>
> > > > Have you any idea?
>
> > > There's no way a browser can contact a "remote public CGI (not under
> > > [your] control)" if that one doesn't explicitly allows it (using
> > > CORS), and were it the case then it would only work for those browsers
> > > that support CORS (recent versions of Firefox, Chrome, Safari and
> > > Opera; IE8 supports it but with a specific API that GWT doesn't use).
>
> > if I paste and copy the remote cgi's url in the browser bar the data
> > get displayed on it (Firefox 3.5.12, IE6 and Chrome 8).
> > In this case something is still possible?
>
> > Thanks,
> > Julio
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