go - What could happen if I don't close response.Body?

Question

In Go, I have some http responses and I sometimes forget to call:

resp.Body.Close()

What happens in this case? will there be a memory leak? Also is it safe to put in defer resp.Body.Close() immediately after getting the response object?

client := http.DefaultClient
resp, err := client.Do(req)
defer resp.Body.Close()
if err != nil {
    return nil, err
}

What if there is an error, could resp or resp.Body be nil?

Answer 1

Waitting for answers