Response.Write("Hello World") to external website

Hi,
I would like to display an output on an external website by including a javascript on that external website.
On my aspx-site i did:
Response.Write("Hello");


On the external site i did:
<div id="test"><script src="http://localhost:49391/Default.aspx" type="text/javascript"></script></div>

I only get a white page on my external site :(
Thanks in advance

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