diff --git a/gorequest.go b/gorequest.go
index 8edb0fc..f179a54 100644
--- a/gorequest.go
+++ b/gorequest.go
@@ -19,6 +19,8 @@ import (
 	"strings"
 	"time"
 
+	"github.com/opentracing/opentracing-go"
+
 	"github.com/pkg/errors"
 
 	"mime/multipart"
@@ -88,6 +90,7 @@ type SuperAgent struct {
 		Attempt         int
 		Enable          bool
 	}
+	SpanContext opentracing.SpanContext
 	//If true prevents clearing Superagent data and makes it possible to reuse it for the next requests
 	DoNotClearSuperAgent bool
 }
@@ -1258,6 +1261,14 @@ func (s *SuperAgent) MakeRequest() (*http.Request, error) {
 		return nil, err
 	}
 
+	if s.SpanContext != nil {
+		// fmt.Println("reject header")
+		opentracing.GlobalTracer().Inject(
+			s.SpanContext,
+			opentracing.HTTPHeaders,
+			opentracing.HTTPHeadersCarrier(req.Header))
+	}
+
 	for k, vals := range s.Header {
 		for _, v := range vals {
 			req.Header.Add(k, v)