Add xhttp transport

common/xray/common.go

@@ -0,0 +1,19 @@
+package common
+
+// Must panics if err is not nil.
+func Must(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+// Must2 panics if the second parameter is not nil, otherwise returns the first parameter.
+func Must2(v interface{}, err error) interface{} {
+	Must(err)
+	return v
+}
+
+// Error2 returns the err from the 2nd parameter.
+func Error2(v interface{}, err error) error {
+	return err
+}