2.2.2.2.3 LongLived-Entity-Body
The LongLived-Entity-Body is sent with a LongLived-POST-Request and LongLived-GET-Response.
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LongLived-Entity-Body = 1*(Encapsulation-Echo-String; section 2.2.1.1.3 / Application-Data); section 2.2.1.1.4 CRLF
The LongLived-Entity-Body MUST be fragmented into multiple messages, each of which is either Encapsulation-Echo-String or Application-Data. As part of the protocol handshake, the Encapsulation-Echo-String MUST be sent as the first fragment of LongLived-Entity-Body. Subsequent fragments MUST be set to Application-Data.