Problem sending http request

I have a Java program that creates a url from a String, then uses the openConnection method of URLConnection to send the request to a web server. The *exact* same Url string works fine from my browser, but the Java program throws a java.io.FileNotFoundException. Other url's work OK.

Any pointers as to what could cause this are appreciated.

[369 byte] By [akw] at [2007-9-26 3:54:09]