Description

As a user, I would like the file-logger plugin to support logging the response body in a custom format to make the logging format more flexible.
Currently the file-logger plugin supports logging the response body, but not logging the response in the way the user wants.
So if the user configures the log format in meta. There will be no way to log the response body. Only clear log format in meta will be enabled.
So I want to add a new var resp_body to let the user put it in a log format which let the user use the response in the way there want.
What do you think about this? If you think this is ok, pls assign me to add this feature.