Detecting wanproxy on peer

[Candy Floss]

Is there any way to find out if the decoder is running on the peer? Let's
say I encode file using wanproxy on machine X and send it to the peer Y on
which the wanproxy has to decode the file. Let's say for some reason
wanproxy on peer Y is not working. Is there any mechanism where I can detect
this and if wanproxy on the peer is not working?

Regards,
Candy
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