I've the following situation: 
I proxy a request to another server and when I made a POST and create a new 
request, the contentLength is zero:

        req2, _ := http.NewRequest(req.Method, newApiUrl , req.Body)
        fmt.Println("New request from body:", req2.ContentLength) // print 0

Checking in the source code of the NewRequest func Body don't respect some 
interface and populate the ContentLength field.

Could be a bug? Which could be a valid approach in order to create a new 
request from an existing one and correct set the Body length?

A working example here:

https://play.golang.org/p/SvCDLj0NrXb

Thanks!

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