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WebSockets offer a mechanism for doing compression of messages. Fiddler's WebSocket Inspector should provide a simpler means of viewing such content.
The mechanism looks to be a simple DEFLATE operation: https://tools.ietf.org/html/rfc7692
Note, supporting permessage-deflate without the
parameters (meaning that context takeover is allowed) likely would be pretty tricky because I don't think the DEFLATE code inside Fiddler is able to reuse a single compression context across multiple operations.
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