http: adjust offset of binary data in raw mode of longpoll socket
http: adjust offset of binary data in raw mode of longpoll socket

Binary data in raw mode provided as ArrayBuffer on the client side.
If one want to use it for reading data as array one should have offset
which is multiple of 4 (for floats) or 8 (for doubles). 
Therefore always adjust offset to be multiple of 8 bytes
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