I'm afraid the problem is not in the URL string itself. I used "+" to concatenate all parts of the street name, because this is what the website code does. The user is supposed to fill in an online form, and click the "Search" button. The URL is displayed in the "Address" field of the browser. Actually, one can use "%20" instead of "+" and it works (in the browser). I just can't quite figure out why the website returns "0 records found" when the very same URL string is sent via HTTP::Request. As I mentioned before, everything works fine if the street name consists of just one word.