code: def open(uri, mode, kerberos=False, user=None, password=None):
      
      if mode == 'rb':
          return BufferedInputBase(uri, mode, kerberos=kerberos, user=user, password=password)
      else:
          raise NotImplementedError('http support for mode %r not implemented' % mode)
docs: Implement streamed reader from a web site.
  
      Supports Kerberos and Basic HTTP authentication.
  
      Parameters
      ----------
      url: str
          The URL to open.
      mode: str
          The mode to open using.
      kerberos: boolean, optional
          If True, will attempt to use the local Kerberos credentials
      user: str, optional
          The username for authenticating over HTTP
      password: str, optional
          The password for authenticating over HTTP
  
      Note
      ----
      If neither kerberos or (user, password) are set, will connect unauthenticated.