EncodeURIComponent Vs. Escape

I've a problem reading querystring parameters that are 'uri encoded'. Anyone
has a solution for this?
To reproduce the problem, create a classic ASP containing the following code:

-----------------------

<p>Value sent via querystring: <%=
Server.HTMLEncode(Request.QueryString("value")) %></p>
<input id="input" />
<button id="submit" onclick="window.location.assign('Test.asp?value=' +
encodeURIComponent(input.value));">submit</button>

-----------------------

Now, enter the value "Dré" and submit. The page will show the value "Dré",
but I except Request.QueryString("value") to return the original value, i.e.
"Dré".