Getting FileNotFoundException on a few URLs. Trying to download

I'm developing a download-everything app for Android devices, and just a few URLs are giving me problems by throwing FileNotFoundException for some reason. I print out the URL and copy it to my browser and it works fine there, so I dont know what the problem is.



Code (minus most exception handling):

URL u = new URL(uri);

HttpURLConnection c = (HttpURLConnection) u.openConnection();

int totalSize = c.getContentLength();
InputStream in = null;
try {
     in = c.getInputStream(); // Exception problem here 

     byte[] buffer = new byte[1024];
     int len1 = 0;

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