error on file download in dev env

[redshiftzero]

This is probably a dev env issue but I'm hitting an error on file download against the dev container on master, filing in case anyone else rapidly knows what the problem is here.

STR

1. Start client
2. Try to download a file (not message)

Expected behavior

File is downloaded

Actual behavior

File download fails, the following appears in logs:

2019-08-20 16:23:29,405 - securedrop_client.logic:613(on_file_download_failure) DEBUG: Failed to download file: HTTPConnectionPool(host='localhost', port=8081): Max retries exceeded with url: /api/v1/sources/236d50e2-34c0-4e4d-9713-665f31a783e3/submissions/a7abf158-c291-43a3-8ef6-c86874c8acce/download (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x112fcd080>: Failed to establish a new connection: [Errno 22] Invalid argument',))

[redshiftzero]

Allie reported not seeing this in dev and I just tried while testing #547 and don't see it (this was almost a month ago so could have been just my dev env), closing

[redshiftzero]

ahhh i just hit this again while testing #563 and it turns out it was due to #546, so if anyone hits this: use very small files until #546 is resolved