code: def _stream_header(file_name, pb_dir):
      
      # Full url of header location
      url = posixpath.join(config.db_index_url, pb_dir, file_name)
      response = requests.get(url)
  
      # Raise HTTPError if invalid url
      response.raise_for_status()
  
      # Get each line as a string
      filelines = response.content.decode('iso-8859-1').splitlines()
  
      # Separate content into header and comment lines
      header_lines = []
      comment_lines = []
  
      for line in filelines:
          line = str(line.strip())
          # Comment line
          if line.startswith('#'):
              comment_lines.append(line)
          # Non-empty non-comment line = header line.
          elif line:
              # Look for a comment in the line
              ci = line.find('#')
              if ci > 0:
                  header_lines.append(line[:ci])
                  # comment on same line as header line
                  comment_lines.append(line[ci:])
              else:
                  header_lines.append(line)
  
      return (header_lines, comment_lines)
docs: Stream the lines of a remote header file.
  
      Parameters
      ----------
      file_name : str
  
      pb_dir : str
          The Physiobank database directory from which to find the
          required header file. eg. For file '100.hea' in
          'http://physionet.org/physiobank/database/mitdb', pb_dir='mitdb'.