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In order to use compression feature from the backend server through Array TMX, the virtual VIP needs to use TCP or TCPS (L4) instead of http or https (L7). In L7, TMX will modify the header identity; therefore, the file is sent to the client without compressed.

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Why backend server compression doesn't work?
In order to use compression feature from the backend server through Array TMX, the virtual VIP needs to use TCP or TCPS (L4) instead of http or https (L7). In L7, TMX will modify the header identity; therefore, the file is sent to the client without compressed.