A simple client-server app used to send and receive file over web-socket
$ pip install tqdm sockets
$ ./server.py <host|ip> <port>
$ ./send_file.py <file_to_send> <server host|ip> <server port>
If a file with the same name of <file_to_send>
is existed in the directory
that ./server.py
runs in there, the sending operation won't work.