How to sniffer data stream on localhost?

Question

local server

Hello, for some purposes I need to write something like a proxy. For ease of debugging and working out the algorithm of actions, I create a socket connection within one computer, but for some reason I don’t see anything through Wireshark (or should it not show such connections?). Enlighten please, a second computer is needed, or you can somehow see how the data is chasing “on the network” (on the socket).

Answer 1

I use this sniffer, there are tools → loopback monitor.

Answer 2

"you can capture on the loopback interface on Linux, on various BSDs including Mac OS X, and on Digital/Tru64 UNIX, and you might be able to do it on Irix and AIX, but you definitely cannot do so on Solaris, HP- UX, or Windows"
wiki.wireshark.org/CaptureSetup/Loopback

Answer 3

select local interface in wireshark?