loading a URL

Hi, I've just spent the past two hours trying to figure out how to do
this, but am confused and bamboozled with all the search results.

I'm trying to create a web app using GWT.
I want it to go to a URL. e.g.
http://ichart.finance.yahoo.com/table.csv?s=IBM&d=9&e=11&f=2011&g=d&a=0&b=2&c=1962&ignore=.csv
Modify the file contents
Allow the user to save the new .csv file to their computer.

I'm stuck at step 1: downloading the file.

I'm new to GWT, and am not sure where to go from here. I've been
reading about RPC, servlets, and other things that have confused me.
I've tried coding things up only to find they're not supported.

Can someone please point me in the right direction? I would like to
know if what I'm trying to do is achievable, and how I should approach
the problem.

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