Go error: Cannot use argument (type []string) as type string in argument

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Trying to get acquainted with go. I want to do something like this:

func validation(){
    headers := metadata.New(map[string]string{"auth":"", "abc": "", "org" : ""})
    token := headers["authorization"]

    data.Add("cookie", token)
}

I am getting the following error cannot use token (type []string) as type string in argument to data.Add. Has this error got to do anything with the metadata(map) I have inside the function?

asked 35 secs ago

Sanket

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Go error: Cannot use argument (type []string) as type string in argument