Rework client interface

client/backoff_test.go

@@ -11,7 +11,7 @@ func TestBackoff(t *testing.T) {
 	delta := time.Duration(0)
 
 	for i := 0; i < 5; i++ {
-		d, err := exponentialBackoff(context.TODO(), NewJsonRequest("test", "test", nil), i)
+		d, err := exponentialBackoff(context.TODO(), NewRequest("test", "test", nil), i)
 		if err != nil {
 			t.Fatal(err)
 		}