Are apps required to listen on localhost to work with the injected proxy seamlessly?

Do I need to have my app listen on localhost for it to work with linkerd proxy?
Alternatively, if my app is listening on the pod IP address, can I simply inject the proxy to my pod and expect the app to continue to work (assuming that I do not want to bypass the proxy)?

Start by locating the website documentation covering Linkerd proxy injection and whether applications must listen on localhost or may use the pod IP address. Confirm the documented behavior for both cases and update the relevant documentation so the networking requirement is explicit.

Written by the indexing model from the issue text.