Poor error message - "bad content length"

[bbockelm]

The grab dependency we use has download resumption logic. If the file appears to be incomplete locally, then the client will resume where it's left off.

However, from this code, if the local copy is larger than the remote server copy, an error is thrown (makes sense -- it's unclear what to do in this case).

The error message is quite confusing:

ERROR[2023-03-08T13:23:03-06:00] Failure downloading /home/cse496/bbockelm/tmp/xrootd_export/hello_world_copy.txt: Attempt #1: Failed to download from localhost:8000 + proxy=false: failed connection setup: bad content length (100ms since start) 
ERROR[2023-03-08T13:23:03-06:00] Errors are retryable                         

We should also not mark this as a retryable error...