Hello - I'm trying to create a file upload form that writes to Blobstore. Let's say my form has two inputs, one of type file, and another, of type text. We'll call the text input the Caption. When the form gets submitted via an XMLHttpRequest from Javascript, I want to be able to say there was a problem with the Caption without having to refresh or redirect the page. Is there any way to do this on App Engine? Or do I need to split up my ajaxy forms and my file upload forms?
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