[Laszlo-dev] Rest Support

[Elias Khalil]

I am trying to call REST APIs from openlaszlo. I tried to make a dataset http request and it worked fine on success. But in case where the REST returns an error like HTTP Error 401 – Unauthorized I can’t read the error string or code. It behaves as the following: 
On proxied mode: dataset.getErrorString()always return null while in debugger there is a message showing the error type but we can’t access it 
On non proxied mode: calling dataset.getErrorString() result in error “client could not parse XML from server” 
Using Xmlhttprequest is also not helpful where it always cast errors types to http error 500 

In order to support calling basic REST APIs, I need to get a clear HTTP Error code and also be able to read the http content in case of error.
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