Using a test file to test network speed.

Its way better to use iperf3 for that. It got way more features like doing several connections in parallel and it writes/read to/from RAM so the storage can't be bottlenecking.
 
i don't you think you can access 8006 port with wget because need authentification.
You must install a small http server which listen on another port with his own www/root folder
 
your original example should probably work if you use another extension for the file, e.g. 'jpg'
so renaming your test.zip to test.jpg and downloading that should work

but on another note, why do you have to use wget? as others have said, iperf is more suited for that and you can start the server on the pve and the client wherever you want and measure the network speed between client <-> pve
(with wget and a file, you test much more than the raw network speed, since the disk/http-stack/perl/etc. come also into play)
 
All I get is HTTP ERROR 501 when trying to download file from browser named lets say *.pdf
I want to use wget because test must be done from any remote computer and no auth. must be used.