old_contents: 
  # Whitelist of environment variables for the subprocess to inherit
  # c.Spawner.env_keep = ['PATH', 'PYTHONPATH', 'CONDA_ROOT', 'CONDA_DEFAULT_ENV', 'VIRTUAL_ENV', 'LANG', 'LC_ALL']
  c.Spawner.env_keep = [ 'PATH', 'LD_LIBRARY_PATH', 'JAVA_HOME', 'CPATH', 'CMAKE_ROOT', 'http_proxy', 'https_proxy' ]
  
  # set of usernames of admin users
  # 
  # If unspecified, only the user that launches the server will be admin.
  #c.Authenticator.admin_users = set(['admin'])
  
new_contents: 
  # Whitelist of environment variables for the subprocess to inherit
  # c.Spawner.env_keep = ['PATH', 'PYTHONPATH', 'CONDA_ROOT', 'CONDA_DEFAULT_ENV', 'VIRTUAL_ENV', 'LANG', 'LC_ALL']
  c.Spawner.env_keep = [ 'PATH', 'LD_LIBRARY_PATH', 'JAVA_HOME', 'CPATH', 'CMAKE_ROOT' ]
  
  # set of usernames of admin users
  # 
  # If unspecified, only the user that launches the server will be admin.
  #c.Authenticator.admin_users = set(['admin'])
  
subject: remove proxy env from child processes