This class represents frame parser, implemented as
Cro::Transform that consumes
Cro::TCP::Message and produces Cro::WebSocket::Frame. It makes no attempt to interpret the meanings of frames (for example, it doesn't decode binary to text, nor try to piece together continuation frames into complete messages). If there is a mask, the payload data will be unmasked.
The parser may be configured with the boolean parameter mask-required, which will be set by a server and not set by a client. If the mask bit in the frame doesn't match this flag, then the frame parser will throw an
X::Cro::WebSocket::IncorrectMaskFlag exception instance.