Add TCP info from server socket

[serrislew]

Current tcpinfo condition from header_rewrite plugin only provides tcp info from the client socket.

• Adding a CLIENT and SERVER qualifier within this condition will provide tcp info from both client and server sockets. This could be beneficial in getting more info on the server connection behavior

[shukitchan]

Please add to the existing documentation as well. thanks.

[SolidWallOfCode]

I thought we were shifting to using the terms "INBOUND" and "OUTBOUND" instead of "CLIENT" and "SERVER".

[zwoop]

As per amc's question, I wonder if this should be changed to e.g.

%{TCP-INFO:INBOUND}
%{TCP-INFO:OUTBOUND}

or

%{INBOUND:TCP-INFO}
%{OUTBOUND:TCP-INFO}

? Also, this patch (or the above) would both be incompatible with current version of ATS 9.x right? As such, we can't put such a change into 9.x, unless you keep the old variation and add the new as an addition.

[serrislew]

New changes should still be compatible. Without qualifiers, it defaults to previous behavior, using the client (inbound) socket.

[serrislew]

[approve ci]

[bryancall]

[approve ci autest]

[bryancall]

[approve ci]

[github-actions[bot]]

This pull request has been automatically marked as stale because it has not had recent activity. Marking it stale to flag it for further consideration by the community.