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    +--------+                                            +--------+
    | CLIENT |                                            | SERVER |
    ...
    |        |                   over the data connection.|        |
    |        |                                            |        |
    +--------+                                            +--------+
    
  2. or download this
    +--------+                                            +--------+
    | CLIENT |                                            | SERVER |
    ...
    |        |                   over the data connection.|        |
    |        |                                            |        |
    +--------+                                            +--------+