def is_resource_modified(
    http_range: str | None = None,
    http_if_range: str | None = None,
    http_if_modified_since: str | None = None,
    http_if_none_match: str | None = None,
    http_if_match: str | None = None,
    etag: str | None = None,
    data: bytes | None = None,
    last_modified: datetime | str | None = None,
    ignore_if_range: bool = True,
) -> bool:
    """Convenience method for conditional requests.
    :param http_range: Range HTTP header
    :param http_if_range: If-Range HTTP header
    :param http_if_modified_since: If-Modified-Since HTTP header
    :param http_if_none_match: If-None-Match HTTP header
    :param http_if_match: If-Match HTTP header
    :param etag: the etag for the response for comparison.
    :param data: or alternatively the data of the response to automatically
                 generate an etag using :func:`generate_etag`.
    :param last_modified: an optional date of the last modification.
    :param ignore_if_range: If `False`, `If-Range` header will be taken into
                            account.
    :return: `True` if the resource was modified, otherwise `False`.

    .. versionadded:: 2.2
    """
    if etag is None and data is not None:
        etag = generate_etag(data)
    elif data is not None:
        raise TypeError("both data and etag given")

    unmodified = False
    if isinstance(last_modified, str):
        last_modified = parse_date(last_modified)

    # HTTP doesn't use microsecond, remove it to avoid false positive
    # comparisons. Mark naive datetimes as UTC.
    if last_modified is not None:
        last_modified = _dt_as_utc(last_modified.replace(microsecond=0))

    if_range = None
    if not ignore_if_range and http_range is not None:
        # https://tools.ietf.org/html/rfc7233#section-3.2
        # A server MUST ignore an If-Range header field received in a request
        # that does not contain a Range header field.
        if_range = parse_if_range_header(http_if_range)

    if if_range is not None and if_range.date is not None:
        modified_since: datetime | None = if_range.date
    else:
        modified_since = parse_date(http_if_modified_since)

    if modified_since and last_modified and last_modified <= modified_since:
        unmodified = True

    if etag:
        etag, _ = unquote_etag(etag)

        if if_range is not None and if_range.etag is not None:
            unmodified = parse_etags(if_range.etag).contains(etag)
        else:
            if_none_match = parse_etags(http_if_none_match)
            if if_none_match:
                # https://tools.ietf.org/html/rfc7232#section-3.2
                # "A recipient MUST use the weak comparison function when comparing
                # entity-tags for If-None-Match"
                unmodified = if_none_match.contains_weak(etag)

            # https://tools.ietf.org/html/rfc7232#section-3.1
            # "Origin server MUST use the strong comparison function when
            # comparing entity-tags for If-Match"
            if_match = parse_etags(http_if_match)
            if if_match:
                unmodified = not if_match.is_strong(etag)

    return not unmodified
Convenience method for conditional requests.
    :param http_range: Range HTTP header
    :param http_if_range: If-Range HTTP header
    :param http_if_modified_since: If-Modified-Since HTTP header
    :param http_if_none_match: If-None-Match HTTP header
    :param http_if_match: If-Match HTTP header
    :param etag: the etag for the response for comparison.
    :param data: or alternatively the data of the response to automatically
                 generate an etag using :func:`generate_etag`.
    :param last_modified: an optional date of the last modification.
    :param ignore_if_range: If `False`, `If-Range` header will be taken into
                            account.
    :return: `True` if the resource was modified, otherwise `False`.

    .. versionadded:: 2.2
    
src/werkzeug/sansio/http.py