There are two kinds of data sent in the memcache protocol: text lines and unstructured data. Text lines are used for commands from clients and responses from servers. Unstructured data is sent when a client wants to store or retrieve data. The server will transmit back unstructured data in exactly the same way it received it, as a byte stream. The server doesn't care about byte order issues in unstructured data and isn't aware of them. There are no limitations on characters that may appear in unstructured data; however, the reader of such data (either a client or a server) will always know, from a preceding text line, the exact length of the data block being transmitted.

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