class_docstr: server protocol. Methods from classes that subclass Server can be called
  transparently from a client
class_docstr_tok: ["server","protocol",".","Methods","from","classes","that","subclass","Server","can","be","called","transparently","from","a","client"]
code: def __init__(self, s, logf=sys.stderr, log_prefix=""):
      self.logf = logf
      self.log_prefix = log_prefix
  
      # connection
  
      self.conn = s
      self.fs = FileSock(s)
  
imports: import os
  import pickle
  import sys
  import _thread
  import traceback
  import socket
  import logging
label_desc: Use image node_id 1 to create a new Server object  with example: obj = Server(s, logf, log_prefix)