In systemd log we get the following:
proxy-server[396412]: STDERR: Traceback (most recent call last):
proxy-server[396412]: STDERR: File "/usr/lib/python3/dist-packages/eventlet/hubs/poll.py", line 111, in wait#012 listener.cb(fileno)
proxy-server[396412]: STDERR: File "/usr/lib/python3/dist-packages/eventlet/greenthread.py", line 221, in main#012 result = function(*args, **kwargs)
proxy-server[396412]: STDERR: File "/usr/lib/python3/dist-packages/eventlet/wsgi.py", line 825, in process_request#012 proto.__init__(conn_state, self)
proxy-server[396412]: STDERR: File "/usr/lib/python3/dist-packages/swift/common/wsgi.py", line 395, in __init__#012 wsgi.HttpProtocol.__init__(self, *args, **kwargs)
proxy-server[396412]: STDERR: File "/usr/lib/python3/dist-packages/eventlet/wsgi.py", line 357, in __init__#012 self.handle()
proxy-server[396412]: STDERR: File "/usr/lib/python3/dist-packages/eventlet/wsgi.py", line 390, in handle#012 self.handle_one_request()
proxy-server[396412]: STDERR: File "/usr/lib/python3/dist-packages/swift/common/wsgi.py", line 521, in handle_one_request#012 got = wsgi.HttpProtocol.handle_one_request(self)
proxy-server[396412]: STDERR: File "/usr/lib/python3/dist-packages/eventlet/wsgi.py", line 419, in handle_one_request#012 self.raw_requestline = self._read_request_line()
proxy-server[396412]: STDERR: File "/usr/lib/python3/dist-packages/swift/common/wsgi.py", line 513, in _read_request_line#012 got = wsgi.HttpProtocol._read_request_line(self)
proxy-server[396412]: STDERR: File "/usr/lib/python3/dist-packages/eventlet/wsgi.py", line 402, in _read_request_line#012 return self.rfile.readline(self.server.url_length_limit)
proxy-server[396412]: STDERR: File "/usr/lib/python3.8/socket.py", line 669, in readinto#012 return self._sock.recv_into(b)
proxy-server[396412]: STDERR: File "/usr/lib/python3/dist-packages/eventlet/greenio/base.py", line 374, in recv_into#012 return self._recv_loop(self.fd.recv_into, 0, buffer, nbytes, flags)
proxy-server[396412]: STDERR: File "/usr/lib/python3/dist-packages/eventlet/greenio/base.py", line 352, in _recv_loop#012 return recv_meth(*args)
proxy-server[396412]: STDERR: TimeoutError: [Errno 110] Connection timed out
proxy-server[396412]: STDERR: Removing descriptor: 65