code: def from_httplib(cls, message):  # Python 2
          
          # python2.7 does not expose a proper API for exporting multiheaders
          # efficiently. This function re-reads raw lines from the message
          # object and extracts the multiheaders properly.
          obs_fold_continued_leaders = (' ', '\t')
          headers = []
  
          for line in message.headers:
              if line.startswith(obs_fold_continued_leaders):
                  if not headers:
                      # We received a header line that starts with OWS as described
                      # in RFC-7230 S3.2.4. This indicates a multiline header, but
                      # there exists no previous header to which we can attach it.
                      raise InvalidHeader(
                          'Header continuation with no previous header: %s' % line
                      )
                  else:
                      key, value = headers[-1]
                      headers[-1] = (key, value + ' ' + line.strip())
                      continue
  
              key, value = line.split(':', 1)
              headers.append((key, value.strip()))
  
          return cls(headers)
docs: Read headers from a Python 2 httplib message object.