class HttpRequestParser: def __init__(self, protocol): """HttpRequestParser   protocol -- a Python object with the following methods  (all optional):   - on_message_begin()  - on_url(url: bytes)  - on_header(name: bytes, value: bytes)  - on_headers_complete()  - on_body(body: bytes)  - on_message_complete()  - on_chunk_header()  - on_chunk_complete()  - on_status(status: bytes)  """ def get_http_version(self) -> str: """Return an HTTP protocol version.""" def should_keep_alive(self) -> bool: """Return ``True`` if keep-alive mode is preferred.""" def should_upgrade(self) -> bool: """Return ``True`` if the parsed request is a valid Upgrade request.  The method exposes a flag set just before on_headers_complete.  Calling this method earlier will only yield `False`.  """ def feed_data(self, data: bytes): """Feed data to the parser.   Will eventually trigger callbacks on the ``protocol``  object.   On HTTP upgrade, this method will raise an  ``HttpParserUpgrade`` exception, with its sole argument  set to the offset of the non-HTTP data in ``data``.  """ def get_method(self) -> bytes: """Return HTTP request method (GET, HEAD, etc)""" class HttpResponseParser: """Has all methods except ``get_method()`` that  HttpRequestParser has.""" def get_status_code(self) -> int: """Return the status code of the HTTP response""" def parse_url(url: bytes): """Parse URL strings into a structured Python object.   Returns an instance of ``httptools.URL`` class with the  following attributes:   - schema: bytes  - host: bytes  - port: int  - path: bytes  - query: bytes  - fragment: bytes  - userinfo: bytes  """