horst12 wrote:
> 
> txtUrl=new qx.ui.form.TextField("http://127.0.0.1:8080";); 
> [...]
> Ps: could it be a problem with my browser?
> 

Not a particular browser problem but apparently a security feature. The
browser won't allow communicating to a different port and/or server unless
you so several local security policy changes. This is suggested by your
localhost ("127.0.0.1") and/or different port (":8080").

Alternatives which quickly occur to me are:
 * Make the data server (one in your port 8080) and the Web server the same.
Simply using a special URL handler for the remote data requests. This is the
preferred option.
 * Use a different transport [1] may also help you work around the issue.
This may cause some performance penalty and additional work, but may be a
solution in case the first one isn't at all viable.
 * Hack the browser's security policy. This is really ugly as will put users
more vulnerable to security exploits and a special configuration step will
be needed for each different browser/user connecting to your application.
This is the worst idea and should be avoided at all cost.

I've also recall related posts in the mailing list (a few months ago) so
searching may also provide you more potential solutions. ;-)

Hope this helps,

 Helder Magalhães

[1] http://demo.qooxdoo.org/current/apiviewer/#qx.io.remote
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