如果满足包头的解析，请返回True，并且递增整个包头的长度到Position，然后赋值BodyLength
如果返回false，意味着缓存剩余数据，此时如果仅仅是因为长度不足，则不必修改其他。
bool IBigUnfixedHeaderRequestInfo.OnParsingHeader<TByteBlock>(
ref TByteBlock byteBlock
)
where TByteBlock : IByteBlock
Private Function OnParsingHeader(Of TByteBlock As IByteBlock) (
ByRef byteBlock As TByteBlock
) As Boolean Implements IBigUnfixedHeaderRequestInfo.OnParsingHeaderprivate abstract OnParsingHeader :
byteBlock : 'TByteBlock byref -> bool when 'TByteBlock : IByteBlock
private override OnParsingHeader :
byteBlock : 'TByteBlock byref -> bool when 'TByteBlock : IByteBlock[缺少 "M:TouchSocket.Http.WebSockets.WSDataFrame.TouchSocket#Core#IBigUnfixedHeaderRequestInfo#OnParsingHeader``1(``0@)" 的 <typeparam name="TByteBlock"/> 文档]