wf:[colon-separated list of features]

bVALUE Set the frame payload. If a masking key is present, the value is encoded automatically.
cINTEGER Set the op code. This can either be an integer from 0-15, or be one of the following opcode names: text (the default), continue, binary, close, ping, pong.
[-]fin Set or un-set the fin bit.
[-]rsv1 Set or un-set the rsv1 bit.
[-]rsv2 Set or un-set the rsv2 bit.
[-]rsv3 Set or un-set the rsv3 bit.
[-]mask Set or un-set the mask bit.
dOFFSET Disconnect after OFFSET bytes.
iOFFSET,VALUE Inject the specified value at the offset.
pOFFSET,SECONDS Pause for SECONDS seconds after OFFSET bytes. SECONDS can be an integer or "f" to pause forever.