Compatible issues with HTTP Keep-Alive option, and TCP connection reuse about cmux HOT 4 CLOSED

CMux is a transparent connection multiplexer. Once a connection is multiplexed, we cannot take back connections that are already multiplexed. In a sense, your problem requires a request multiplexer, which has to be implemented inside your server as requests come in, not outside. The only way to do this in CMux is fake a connection per request which is against the point and is quite expensive. So, I'm afraid, this is not something we can fix or add to CMux.

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@soheilhy thanks for ur reply, i totally agree with ur explanations and thoughts.

pls help to inspire me on what are those best use cases for cmux or more generally to say a layer 4 connection multiplexer?

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Connection multiplexing is the only use case for Cmux, where you have multiple listeners and you want to use them transparently on a single port. It's not really about layers (i.e., L4 or L7 multiplexing), but about stickiness of multiplexing decision.

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