async def ask_queries(reader, writer):
    """
    This set of commands seems to elicit all of the unique information I can get out of
    my receiver.  (Denon AVR-S730H)

    :param reader:
    :param writer:
    :return:
    """

    commands = ["PW?", "MV?", "CV?", "MU?", "SI?"]
    commands += ["ZM?", "SV?", "SD?", "SLP?", "MS?"]
    commands += ["MSQUICK ?", "PSLOM ?"]
    commands += ["PSMULTEQ: ?", "PSDYNEQ ?", "PSREFLEV ?", "PSDYNVOL ?"]
    commands += ["PSEFF ?", "PSDEL ?", "PSSWR ?", "PSRSTR ?"]
    commands += ["Z2?", "Z2MU?", "Z2SLP?", "Z2QUICK ?", "TMAN?"]

    # commands = [b"Z2ON", b"SINET"]
    facts = MultiDict()
    for command in commands:
        writer.write(command.encode("ascii") + b"\r")
        lines = await read_lines_until(reader, 0.1)
        for line in lines:
            facts.add(line.strip(), command)
    return facts

    def post(self):
        """Return POST parameters."""
        if self._post is not None:
            return self._post
        if self.method not in self.POST_METHODS:
            self._post = MultiDictProxy(MultiDict())
            return self._post

        content_type = self.content_type
        if (content_type not in ('',
                                 'application/x-www-form-urlencoded',
                                 'multipart/form-data')):
            self._post = MultiDictProxy(MultiDict())
            return self._post

        body = yield from self.read()
        content_charset = self.charset or 'utf-8'

        environ = {'REQUEST_METHOD': self.method,
                   'CONTENT_LENGTH': str(len(body)),
                   'QUERY_STRING': '',
                   'CONTENT_TYPE': self.headers.get(hdrs.CONTENT_TYPE)}

        fs = cgi.FieldStorage(fp=io.BytesIO(body),
                              environ=environ,
                              keep_blank_values=True,
                              encoding=content_charset)

        supported_transfer_encoding = {
            'base64': binascii.a2b_base64,
            'quoted-printable': binascii.a2b_qp
        }

        out = MultiDict()
        _count = 1
        for field in fs.list or ():
            transfer_encoding = field.headers.get(
                hdrs.CONTENT_TRANSFER_ENCODING, None)
            if field.filename:
                ff = FileField(field.name,
                               field.filename,
                               field.file,  # N.B. file closed error
                               field.type)
                if self._post_files_cache is None:
                    self._post_files_cache = {}
                self._post_files_cache[field.name+str(_count)] = field
                _count += 1
                out.add(field.name, ff)
            else:
                value = field.value
                if transfer_encoding in supported_transfer_encoding:
                    # binascii accepts bytes
                    value = value.encode('utf-8')
                    value = supported_transfer_encoding[
                        transfer_encoding](value)
                out.add(field.name, value)

        self._post = MultiDictProxy(out)
        return self._post

    def update_query(self, *args, **kwargs):
        """Return a new URL with query part updated."""
        s = self._get_str_query(*args, **kwargs)
        new_query = MultiDict(parse_qsl(s, keep_blank_values=True))
        query = MultiDict(self.query)
        query.update(new_query)

        return URL(self._val._replace(query=self._get_str_query(query)), encoded=True)

    def __init__(self, method, url, *,
                 params=None, headers=None, skip_auto_headers=frozenset(),
                 data=None, cookies=None,
                 auth=None, version=http.HttpVersion11, compress=None,
                 chunked=None, expect100=False,
                 loop=None, response_class=None,
                 proxy=None, proxy_auth=None,
                 timer=None, session=None, auto_decompress=True,
                 verify_ssl=None, fingerprint=None, ssl_context=None,
                 proxy_headers=None):

        if verify_ssl is False and ssl_context is not None:
            raise ValueError(
                "Either disable ssl certificate validation by "
                "verify_ssl=False or specify ssl_context, not both.")

        if loop is None:
            loop = asyncio.get_event_loop()

        assert isinstance(url, URL), url
        assert isinstance(proxy, (URL, type(None))), proxy
        self._session = session
        if params:
            q = MultiDict(url.query)
            url2 = url.with_query(params)
            q.extend(url2.query)
            url = url.with_query(q)
        self.url = url.with_fragment(None)
        self.original_url = url
        self.method = method.upper()
        self.chunked = chunked
        self.compress = compress
        self.loop = loop
        self.length = None
        self.response_class = response_class or ClientResponse
        self._timer = timer if timer is not None else TimerNoop()
        self._auto_decompress = auto_decompress
        self._verify_ssl = verify_ssl
        self._ssl_context = ssl_context

        if loop.get_debug():
            self._source_traceback = traceback.extract_stack(sys._getframe(1))

        self.update_version(version)
        self.update_host(url)
        self.update_headers(headers)
        self.update_auto_headers(skip_auto_headers)
        self.update_cookies(cookies)
        self.update_content_encoding(data)
        self.update_auth(auth)
        self.update_proxy(proxy, proxy_auth, proxy_headers)
        self.update_fingerprint(fingerprint)

        self.update_body_from_data(data)
        if data or self.method not in self.GET_METHODS:
            self.update_transfer_encoding()
        self.update_expect_continue(expect100)

    def links(self):
        links_str = ", ".join(self.headers.getall("link", []))

        links = MultiDict()

        if not links_str:
            return MultiDictProxy(links)

        for val in re.split(r",(?=\s*<)", links_str):
            url, params = re.match(r"\s*<(.*)>(.*)", val).groups()
            params = params.split(";")[1:]

            link = MultiDict()

            for param in params:
                key, _, value, _ = re.match(
                    r"^\s*(\S*)\s*=\s*(['\"]?)(.*?)(\2)\s*$",
                    param, re.M
                ).groups()

                link.add(key, value)

            key = link.get("rel", url)

            link.add("url", self.url.join(URL(url)))

            links.add(key, MultiDictProxy(link))

        return MultiDictProxy(links)

    def implicit_tvals(self):
        tvals = dict()
        ret = defaultdict(NoClobberDict)

        tls = self.tlayers
        rls = self.rlayers

        tl_n = [t.category for t in tls]

        def _parse_spec(s):
            c, v = s.split('=')
            return (c, v.split(','))

        for c in self.controls:
            tvs = []
            for specs, region in c.tval_specs:
                wsd = MultiDict()
                for w in region:
                    # wsd[self.values(w, rls)] = w
                    rv = tuple(zip([l.category for l in rls],
                                   self.values(w, rls)))
                    wsd[rv] = w


                for rl, ws in wsd.items():
                    tl_v = map(list,
                               map(set, zip(*[self.values(w, tls)
                                              for w in sorted(ws)])))

                    assert len(tl_n) == len(tl_v)

                    available = zip(tl_n, tl_v)
                    tmp = dict(available +
                               map(_parse_spec, specs.split('*')))

                    chunk = [(tl, rl) for tl in
                             list(product(*[tmp[t] for t in tl_n]))]
                    tvs.append(chunk)

            from itertools import combinations
            assert 0 == sum(map(len, [set.intersection(set(x), set(y))
                                      for x, y in list(combinations(tvs, 2))]))

            for tv, rv in sorted(set(sum(tvs, []))):
                ret[tv][rv] = c

        return dict([(k, dict(v)) for k, v in ret.items()])

    def __init__(self, method, url, *,
                 params=None, headers=None, skip_auto_headers=frozenset(),
                 data=None, cookies=None,
                 auth=None, version=http.HttpVersion11, compress=None,
                 chunked=None, expect100=False,
                 loop=None, response_class=None,
                 proxy=None, proxy_auth=None, proxy_from_env=False,
                 timer=None, session=None, auto_decompress=True):

        if loop is None:
            loop = asyncio.get_event_loop()

        assert isinstance(url, URL), url
        assert isinstance(proxy, (URL, type(None))), proxy
        self._session = session
        if params:
            q = MultiDict(url.query)
            url2 = url.with_query(params)
            q.extend(url2.query)
            url = url.with_query(q)
        self.url = url.with_fragment(None)
        self.original_url = url
        self.method = method.upper()
        self.chunked = chunked
        self.compress = compress
        self.loop = loop
        self.length = None
        self.response_class = response_class or ClientResponse
        self._timer = timer if timer is not None else TimerNoop()
        self._auto_decompress = auto_decompress

        if loop.get_debug():
            self._source_traceback = traceback.extract_stack(sys._getframe(1))

        self.update_version(version)
        self.update_host(url)
        self.update_headers(headers)
        self.update_auto_headers(skip_auto_headers)
        self.update_cookies(cookies)
        self.update_content_encoding(data)
        self.update_auth(auth)
        self.update_proxy(proxy, proxy_auth, proxy_from_env)

        self.update_body_from_data(data)
        self.update_transfer_encoding()
        self.update_expect_continue(expect100)

 def info_data(self, request, **params):
     headers = self.getheaders(request)
     data = {'method': request.method,
             'headers': headers,
             'pulsar': self.pulsar_info(request)}
     if request.method in ENCODE_URL_METHODS:
         data['args'] = as_dict(request.url_data)
     else:
         args, files = request.data_and_files()
         jfiles = MultiDict()
         if files:
             for name, part in files.items():
                 try:
                     part = part.string()
                 except UnicodeError:
                     part = part.base64()
                 jfiles.add(name, part)
         data.update((('args', as_dict(args)),
                      ('files', as_dict(jfiles))))
     data.update(params)
     return data

def parse_mimetype(mimetype: str) -> MimeType:
    """Parses a MIME type into its components.

    mimetype is a MIME type string.

    Returns a MimeType object.

    Example:

    >>> parse_mimetype('text/html; charset=utf-8')
    MimeType(type='text', subtype='html', suffix='',
             parameters={'charset': 'utf-8'})

    """
    if not mimetype:
        return MimeType(type='', subtype='', suffix='',
                        parameters=MultiDictProxy(MultiDict()))

    parts = mimetype.split(';')
    params = MultiDict()  # type: MultiDict[str]
    for item in parts[1:]:
        if not item:
            continue
        key, value = cast(Tuple[str, str],
                          item.split('=', 1) if '=' in item else (item, ''))
        params.add(key.lower().strip(), value.strip(' "'))

    fulltype = parts[0].strip().lower()
    if fulltype == '*':
        fulltype = '*/*'

    mtype, stype = (cast(Tuple[str, str], fulltype.split('/', 1))
                    if '/' in fulltype else (fulltype, ''))
    stype, suffix = (cast(Tuple[str, str], stype.split('+', 1))
                     if '+' in stype else (stype, ''))

    return MimeType(type=mtype, subtype=stype, suffix=suffix,
                    parameters=MultiDictProxy(params))

    def links(self) -> 'MultiDictProxy[MultiDictProxy[Union[str, URL]]]':
        links_str = ", ".join(self.headers.getall("link", []))

        if not links_str:
            return MultiDictProxy(MultiDict())

        links = MultiDict()  # type: MultiDict[MultiDictProxy[Union[str, URL]]]

        for val in re.split(r",(?=\s*<)", links_str):
            match = re.match(r"\s*<(.*)>(.*)", val)
            if match is None:  # pragma: no cover
                # the check exists to suppress mypy error
                continue
            url, params_str = match.groups()
            params = params_str.split(";")[1:]

            link = MultiDict()  # type: MultiDict[Union[str, URL]]

            for param in params:
                match = re.match(
                    r"^\s*(\S*)\s*=\s*(['\"]?)(.*?)(\2)\s*$",
                    param, re.M
                )
                if match is None:  # pragma: no cover
                    # the check exists to suppress mypy error
                    continue
                key, _, value, _ = match.groups()

                link.add(key, value)

            key = link.get("rel", url)  # type: ignore

            link.add("url", self.url.join(URL(url)))

            links.add(key, MultiDictProxy(link))

        return MultiDictProxy(links)

    def post(self):
        """Return POST parameters."""
        if self._post is not None:
            return self._post
        if self._method not in self.POST_METHODS:
            self._post = MultiDictProxy(MultiDict())
            return self._post

        content_type = self.content_type
        if (content_type not in ('',
                                 'application/x-www-form-urlencoded',
                                 'multipart/form-data')):
            self._post = MultiDictProxy(MultiDict())
            return self._post

        out = MultiDict()

        if content_type == 'multipart/form-data':
            multipart = yield from self.multipart()

            field = yield from multipart.next()
            while field is not None:
                size = 0
                max_size = self._client_max_size
                content_type = field.headers.get(hdrs.CONTENT_TYPE)

                if field.filename:
                    # store file in temp file
                    tmp = tempfile.TemporaryFile()
                    chunk = yield from field.read_chunk(size=2**16)
                    while chunk:
                        chunk = field.decode(chunk)
                        tmp.write(chunk)
                        size += len(chunk)
                        if max_size > 0 and size > max_size:
                            raise ValueError(
                                'Maximum request body size exceeded')
                        chunk = yield from field.read_chunk(size=2**16)
                    tmp.seek(0)

                    ff = FileField(field.name, field.filename,
                                   tmp, content_type, field.headers)
                    out.add(field.name, ff)
                else:
                    value = yield from field.read(decode=True)
                    if content_type is None or \
                            content_type.startswith('text/'):
                        charset = field.get_charset(default='utf-8')
                        value = value.decode(charset)
                    out.add(field.name, value)
                    size += len(value)
                    if max_size > 0 and size > max_size:
                        raise ValueError(
                            'Maximum request body size exceeded')

                field = yield from multipart.next()
        else:
            data = yield from self.read()
            if data:
                charset = self.charset or 'utf-8'
                out.extend(
                    parse_qsl(
                        data.rstrip().decode(charset),
                        keep_blank_values=True,
                        encoding=charset))

        self._post = MultiDictProxy(out)
        return self._post

    def __init__(self, method: str, url: URL, *,
                 params: Optional[Mapping[str, str]]=None,
                 headers: Optional[LooseHeaders]=None,
                 skip_auto_headers: Iterable[str]=frozenset(),
                 data: Any=None,
                 cookies: Optional[LooseCookies]=None,
                 auth: Optional[BasicAuth]=None,
                 version: http.HttpVersion=http.HttpVersion11,
                 compress: Optional[str]=None,
                 chunked: Optional[bool]=None,
                 expect100: bool=False,
                 loop: Optional[asyncio.AbstractEventLoop]=None,
                 response_class: Optional[Type['ClientResponse']]=None,
                 proxy: Optional[URL]=None,
                 proxy_auth: Optional[BasicAuth]=None,
                 timer: Optional[BaseTimerContext]=None,
                 session: Optional['ClientSession']=None,
                 ssl: Union[SSLContext, bool, Fingerprint, None]=None,
                 proxy_headers: Optional[LooseHeaders]=None,
                 traces: Optional[List['Trace']]=None):

        if loop is None:
            loop = asyncio.get_event_loop()

        assert isinstance(url, URL), url
        assert isinstance(proxy, (URL, type(None))), proxy
        # FIXME: session is None in tests only, need to fix tests
        # assert session is not None
        self._session = cast('ClientSession', session)
        if params:
            q = MultiDict(url.query)
            url2 = url.with_query(params)
            q.extend(url2.query)
            url = url.with_query(q)
        self.original_url = url
        self.url = url.with_fragment(None)
        self.method = method.upper()
        self.chunked = chunked
        self.compress = compress
        self.loop = loop
        self.length = None
        if response_class is None:
            real_response_class = ClientResponse
        else:
            real_response_class = response_class
        self.response_class = real_response_class  # type: Type[ClientResponse]
        self._timer = timer if timer is not None else TimerNoop()
        self._ssl = ssl

        if loop.get_debug():
            self._source_traceback = traceback.extract_stack(sys._getframe(1))

        self.update_version(version)
        self.update_host(url)
        self.update_headers(headers)
        self.update_auto_headers(skip_auto_headers)
        self.update_cookies(cookies)
        self.update_content_encoding(data)
        self.update_auth(auth)
        self.update_proxy(proxy, proxy_auth, proxy_headers)

        self.update_body_from_data(data)
        if data or self.method not in self.GET_METHODS:
            self.update_transfer_encoding()
        self.update_expect_continue(expect100)
        if traces is None:
            traces = []
        self._traces = traces

 def request(self, method, path, params=(), auth=None, **kwargs):
     kwargs['auth'] = TokenAuth(auth) if isinstance(auth, dict) else auth
     params = MultiDict(params)
     params.extend(self.params)
     url = urljoin(self.url, path).rstrip('/') + self.trailing
     return super().request(method, url, params=params, **kwargs)

    async def post(self) -> MultiDictProxy:
        """Return POST parameters."""
        if self._post is not None:
            return self._post
        if self._method not in self.POST_METHODS:
            self._post = MultiDictProxy(MultiDict())
            return self._post

        content_type = self.content_type
        if (content_type not in ('',
                                 'application/x-www-form-urlencoded',
                                 'multipart/form-data')):
            self._post = MultiDictProxy(MultiDict())
            return self._post

        out = MultiDict()  # type: MultiDict

        if content_type == 'multipart/form-data':
            multipart = await self.multipart()
            max_size = self._client_max_size

            field = await multipart.next()
            while field is not None:
                size = 0
                content_type = field.headers.get(hdrs.CONTENT_TYPE)

                if field.filename:
                    # store file in temp file
                    tmp = tempfile.TemporaryFile()
                    chunk = await field.read_chunk(size=2**16)
                    while chunk:
                        chunk = field.decode(chunk)
                        tmp.write(chunk)
                        size += len(chunk)
                        if 0 < max_size < size:
                            raise HTTPRequestEntityTooLarge(
                                max_size=max_size,
                                actual_size=size
                            )
                        chunk = await field.read_chunk(size=2**16)
                    tmp.seek(0)

                    ff = FileField(field.name, field.filename,
                                   cast(io.BufferedReader, tmp),
                                   content_type, field.headers)
                    out.add(field.name, ff)
                else:
                    value = await field.read(decode=True)
                    if content_type is None or \
                            content_type.startswith('text/'):
                        charset = field.get_charset(default='utf-8')
                        value = value.decode(charset)
                    out.add(field.name, value)
                    size += len(value)
                    if 0 < max_size < size:
                        raise HTTPRequestEntityTooLarge(
                            max_size=max_size,
                            actual_size=size
                        )

                field = await multipart.next()
        else:
            data = await self.read()
            if data:
                charset = self.charset or 'utf-8'
                out.extend(
                    parse_qsl(
                        data.rstrip().decode(charset),
                        keep_blank_values=True,
                        encoding=charset))

        self._post = MultiDictProxy(out)
        return self._post