code: def get_longest_table(url='https://www.openoffice.org/dev_docs/source/file_extensions.html', header=0):
      
      dfs = pd.read_html(url, header=header)
      return longest_table(dfs)
docs: Retrieve the HTML tables from a URL and return the longest DataFrame found
  
      >>> get_longest_table('https://en.wikipedia.org/wiki/List_of_sovereign_states').columns
      Index(['Common and formal names', 'Membership within the UN System[a]',
         'Sovereignty dispute[b]',
         'Further information on status and recognition of sovereignty[d]'],
        dtype='object')