FileNotFoundException for HttpURLConnection in Ice Cream Sandwich

Question

I have an Android app that works fine with Android 2.x and 3.x, but it fails when run on Android 4.x.

The problem is in this section of code:

URL url         


        

Answer 1

A FileNotFoundException may also been thrown if the server returns a bad error code (e.g., 400 or 401). You can handle this as follows:

int responseCode = con.getResponseCode(); //can call this instead of con.connect()
if (responseCode >= 400 && responseCode <= 499) {
    throw new Exception("Bad authentication status: " + responseCode); //provide a more meaningful exception message
}
else {
    InputStream in = con.getInputStream();
    //etc...
}

Answer 2

A little late but you can also verify the accepted content. You can add this line to accept all kinds of contents

urlConnection.setRequestProperty("Accept","*/*");

Answer 3

Try removing the setDoOutput call. Taken from this blog: a blog

Edit: This is needed when using a POST call.

Answer 4

I Don't know why, but dealing manually with redirection resolves the problem.

connection.setInstanceFollowRedirects(false);