diff --git a/default.go b/default.go
index 59cce6c..8ab4c3e 100644
--- a/default.go
+++ b/default.go
@@ -60,39 +60,61 @@ type DefaultRequestBuilder struct {
 	allowedMethods *[]string
 	header         struct {
 		*Header
-		fields *header
+		fields header
 	}
 	values struct {
 		*Values
-		fields *values
+		fields values
 	}
 	body struct {
 		*Body
-		fields *body
+		fields body
 	}
 }
 
-func NewDefaultRequestBuilder(rb RequestBuilder, am *[]string, h *Header, hf *header, v *Values, vf *values, b *Body, bf *body) DefaultRequestBuilder {
+func NewDefaultRequestBuilder(rb RequestBuilder, am *[]string, h *Header, hf header, v *Values, vf values, b *Body, bf body) DefaultRequestBuilder {
+	if am == nil {
+		amd := make([]string, 0)
+		am = &amd
+	}
+	if h == nil || hf == nil {
+		hd := make(Header)
+		h = &hd
+		hfd := struct{ Header }{Header: hd}
+		hf = &hfd
+	}
+	if v == nil || vf == nil {
+		vd := make(Values)
+		v = &vd
+		vfd := struct{ Values }{Values: vd}
+		vf = &vfd
+	}
+	if b == nil || bf == nil {
+		bd := make(Body, 0)
+		b = &bd
+		bfd := struct{ Body }{Body: bd}
+		bf = &bfd
+	}
 	return DefaultRequestBuilder{
 		requestBuilder: rb,
 		allowedMethods: am,
 		header: struct {
 			*Header
-			fields *header
+			fields header
 		}{
 			Header: h,
 			fields: hf,
 		},
 		values: struct {
 			*Values
-			fields *values
+			fields values
 		}{
 			Values: v,
 			fields: vf,
 		},
 		body: struct {
 			*Body
-			fields *body
+			fields body
 		}{
 			Body:   b,
 			fields: bf,
@@ -140,13 +162,46 @@ func (rb *DefaultRequestBuilder) Values(values Values) (errRes ErrorResponse) {
 }
 
 type DefaultResponse struct {
-	header struct {
+	response Response
+	header   struct {
 		*Header
-		fields *header
+		fields header
 	}
 	body struct {
 		*Body
-		fields *body
+		fields body
+	}
+}
+
+func NewDefaultResponse(r Response, h *Header, hf header, b *Body, bf body) DefaultResponse {
+	if h == nil || hf == nil {
+		hd := make(Header)
+		h = &hd
+		hfd := struct{ Header }{Header: hd}
+		hf = &hfd
+	}
+	if b == nil || bf == nil {
+		bd := make(Body, 0)
+		b = &bd
+		bfd := struct{ Body }{Body: bd}
+		bf = &bfd
+	}
+	return DefaultResponse{
+		response: r,
+		header: struct {
+			*Header
+			fields header
+		}{
+			Header: h,
+			fields: hf,
+		},
+		body: struct {
+			*Body
+			fields body
+		}{
+			Body:   b,
+			fields: bf,
+		},
 	}
 }