logger_json v5.1.2

LoggerJSON.PlugUtils.remote_ip

You're seeing just the function remote_ip, go back to LoggerJSON.PlugUtils module for more information.
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remote_ip(conn)

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Grabs the client IP address from Plug.Conn. First we try to grab the client IP from the x-forwarded-for header. Then we fall back to the conn.remote_ip field.