parameters: (self, url, domain, cookie_file)
docstring: Initializes a Retriever object.
  
      Args:
        url: url to download page from.
        domain: only links with this domain will be retrieved.
        cookie_file: the name of a cookie file, needed for pages that use session
            cookies to change their contents.
docstring_summary: Initializes a Retriever object.
docstring_tokens: Initializes a Retriever object .
function: def __init__(self, url, domain, cookie_file):
      """Initializes a Retriever object.
  
      Args:
        url: url to download page from.
        domain: only links with this domain will be retrieved.
        cookie_file: the name of a cookie file, needed for pages that use session
            cookies to change their contents.
      """
      self._url = url
      self._domain = domain
      self._html_content = ''
  
      # Http links without clues from LINK_CLUES.
      self._general_links = []
      # Http links that contain a clue from LINK_CLUES.
      self._clues_general_links = []
      # Https links that do not contain any clues from LINK_CLUES.
      self._secure_links = []
      # Https links that contain a clue from LINK_CLUES.
      self._clues_secure_links = []
      self._cookie_file = cookie_file
      self._curl_object = None
function_tokens: def __init__ ( self , url , domain , cookie_file ) : self . _url = url self . _domain = domain self . _html_content = '' # Http links without clues from LINK_CLUES. self . _general_links = [ ] # Http links that contain a clue from LINK_CLUES. self . _clues_general_links = [ ] # Https links that do not contain any clues from LINK_CLUES. self . _secure_links = [ ] # Https links that contain a clue from LINK_CLUES. self . _clues_secure_links = [ ] self . _cookie_file = cookie_file self . _curl_object = None