[go-nuts] Does client.go#transport() reuse s global DefaultTransport when http.Client's Transport is nil?

[Kyle Butz]

Hi All!

I'm having trouble understanding whether a new http.Client{} with no 
Transport set will use a new copy of DefaultTransport, or the global?

>From client.go:

func (c *Client) transport() RoundTripper {
   if c.Transport != nil {
      return c.Transport
   }
   return DefaultTransport
}

DefaultTransport's definition from transport.go, as a pointer to a 
Transport struct:

var DefaultTransport RoundTripper = &Transport{
 Proxy: ProxyFromEnvironment,
 DialContext: (&net.Dialer{
 Timeout: 30 * time.Second,
 KeepAlive: 30 * time.Second,
 DualStack: true,
 }).DialContext,
 MaxIdleConns: 100,
 IdleConnTimeout: 90 * time.Second,
 TLSHandshakeTimeout: 10 * time.Second,
 ExpectContinueTimeout: 1 * time.Second,
}


It looks like transport() is returning a RoundTripper by value. Does that 
mean that "return DefaultTransport" returns a new copy of DefaultTransport, 
or just a copy of a pointer to the global DefaultTransport defined in 
transport.go?

Thanks for any tips!
Kyle

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