def _read_http_continuation(self, size, kind, flag):
_flag = dict(<EOL>END_HEADERS=False,      <EOL>)<EOL>for index, bit in enumerate(flag):<EOL><INDENT>if index == <NUM_LIT:2> and bit:<EOL><INDENT>_flag['<STR_LIT>'] = True<EOL><DEDENT>elif bit:<EOL><INDENT>raise ProtocolError(f'<STR_LIT>', quiet=True)<EOL><DEDENT>else:<EOL><INDENT>continue<EOL><DEDENT><DEDENT>_frag = self._read_fileng(size) or None<EOL>data = dict(<EOL>flags=_flag,<EOL>frag=_frag,<EOL>)<EOL>return data<EOL>
Read HTTP/2 WINDOW_UPDATE frames.

        Structure of HTTP/2 WINDOW_UPDATE frame [RFC 7540]:
            +-----------------------------------------------+
            |                 Length (24)                   |
            +---------------+---------------+---------------+
            |   Type (8)    |   Flags (8)   |
            +-+-------------+---------------+-------------------------------+
            |R|                 Stream Identifier (31)                      |
            +---------------------------------------------------------------+
            |                   Header Block Fragment (*)                 ...
            +---------------------------------------------------------------+

            Octets      Bits        Name                    Description
              0           0     http.length             Length
              3          24     http.type               Type (2)
              4          32     http.flags              Flags
              5          40     -                       Reserved
              5          41     http.sid                Stream Identifier
              9          73     http.frag               Header Block Fragment