diff --git a/session.go b/session.go
index 800c1a8..af75451 100644
--- a/session.go
+++ b/session.go
@@ -116,25 +116,37 @@ type Session struct {
 const (
 	// TypeJSON 类型
 	TypeJSON = "application/json"
+
 	// TypeXML 类型
 	TypeXML = "text/xml"
+
 	// TypePlain 类型
 	TypePlain = "text/plain"
+
 	// TypeHTML 类型
 	TypeHTML = "text/html"
+
 	// TypeURLENCODED 类型
 	TypeURLENCODED = "application/x-www-form-urlencoded"
+
 	// TypeForm PostForm类型
 	TypeForm = TypeURLENCODED
+
+	// TypeStream application/octet-stream 类型 binary
+	TypeStream = "application/octet-stream"
+
 	// TypeFormData 类型
 	TypeFormData = "multipart/form-data"
+
 	// TypeMixed Mixed类型
 	TypeMixed = "multipart/mixed"
 
 	// HeaderKeyHost Host
 	HeaderKeyHost = "Host"
+
 	// HeaderKeyUA User-Agent
 	HeaderKeyUA = "User-Agent"
+
 	// HeaderKeyContentType Content-Type
 	HeaderKeyContentType = "Content-Type"
 )