Method RoundTrip

core/remotes/docker/resolver.go:959–996

(r *http.Request)

}

func (f *httpFallback) RoundTrip(r *http.Request) (*http.Response, error) {
	f.mu.Lock()
	fallback := f.host == r.URL.Host
	f.mu.Unlock()

	// only fall back if the same host had previously fell back
	if !fallback {
		resp, err := f.super.RoundTrip(r)
		if !isTLSError(err) && !isPortError(err, r.URL.Host) {
			return resp, err
		}
	}

	plainHTTPUrl := *r.URL
	plainHTTPUrl.Scheme = "http"

	plainHTTPRequest := *r
	plainHTTPRequest.URL = &plainHTTPUrl

	if !fallback {
		f.mu.Lock()
		if f.host != r.URL.Host {
			f.host = r.URL.Host
		}
		f.mu.Unlock()

		// update body on the second attempt
		if r.Body != nil && r.GetBody != nil {
			body, err := r.GetBody()
			if err != nil {
				return nil, err
			}
			plainHTTPRequest.Body = body
		}
	}

	return f.super.RoundTrip(&plainHTTPRequest)
}

func isTLSError(err error) bool {
	if err == nil {