Function shouldRetryDial

internal/http2/client_conn_pool.go:262–281

shouldRetryDial reports whether the current request should retry dialing after the call finished unsuccessfully, for example if the dial was canceled because of a context cancellation or deadline expiry.

(call *dialCall, req *http.Request)

// if the dial was canceled because of a context cancellation or
// deadline expiry.
func shouldRetryDial(call *dialCall, req *http.Request) bool {
	if call.err == nil {
		// No error, no need to retry
		return false
	}
	if call.ctx == req.Context() {
		// If the call has the same context as the request, the dial
		// should not be retried, since any cancellation will have come
		// from this request.
		return false
	}
	if !errors.Is(call.err, context.Canceled) && !errors.Is(call.err, context.DeadlineExceeded) {
		// If the call error is not because of a context cancellation or a deadline expiry,
		// the dial should not be retried.
		return false
	}
	// Only retry if the error is a context cancellation error or deadline expiry
	// and the context associated with the call was canceled or expired.
	return call.ctx.Err() != nil
}