How to debug echo with delve?

[joofjang]

I'm new to echo. My new workplace use echo in one of services. I've try to debug the server using delve in Goland & VScode without any success.
The problem is when I sent requests to the debugged server, the debugger in IDEs don't stop at any breakpoints in handlers (but they can stop at breakpoints in main() when start a server).
I've google around and found someone also has the same problem as I do but there is not any solution to it.