On Wed, Oct 17, 2018 at 10:30 AM Kyle Butz <kyleb...@gmail.com> wrote:
>
> 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?
DefaultTransport is a pointer to a Transport, so when transport()
returns DefaultTransport, it returns an interface containing a copy of
the pointer to the Transport used to initialize DefaultTransport.
>
> Thanks for any tips!
> Kyle
>
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