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@@ -90,6 +90,10 @@ type Builder struct {
                      func New(opt Opt) (*Builder, error) {
                      	reqHandler := newReqBodyHandler(tracing.DefaultTransport)
                     +	if opt.IdentityMapping != nil && opt.IdentityMapping.Empty() {
                     +		opt.IdentityMapping = nil
                     +	}
+                    +
                      	c, err := newController(reqHandler, opt)
                      	if err != nil {
                      		return nil, err

builder-next: reset identitymapping if empty