I’m trying to code a lambda function that fetches a zip file from an URL in the internet.

The code is pretty simple:

try {
    InputStream in = new URL( urlString ).openStream();
    //do some stuff here
    in.close();
} catch (Exception e) {
    return e;
}

When I run it localy it works perfectly. It also works when I run it with a lambda within a VPC with nat gateway. Howerver, every time I run it within my lambda without VPC I receive a catch error.

Many tutorials state that lambda function without VPC should have internet acess.

Am I doing something wrong, or am I understanding something wrong?
Thanks