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Q: 

GWT: how do I check the response code after a file upload ?

I'm using a GWT FormPanel to upload a file; the file is processed on the server and I place the result on the client side.

FormPanel works correctly, as in this question (How to get a submission result out of FormPanel), but what if the server responds a 404 or 500 ?

How do I capture the http response after a file upload ?

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