Rex, I presume you meant that any unsuccessful attempt to download a file from a website via HTTP the COPY command exit code will be 2, regardless of the reason for the failure.
Does the HTTP include a method to determine whether or not a downloadable source file exists (analogous to the IF ISFILE status test in TCC)? Or is the only thing a user can do is to try repeatedly and eventually give up? Based on your above answer this question might better be in the Open Forum, but it is a logical outgrowth of the original question...