Improved error handling

lib.go

@@ -4,10 +4,10 @@ import (
 	"bytes"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"io"
 	"net/http"
 	"strings"
-	"fmt"
 )
 
 type Cli struct {
@@ -57,7 +57,11 @@ func (c *Cli) Do(method string, strurl string, body []byte) (*http.Response, err
 		}
 	}
 	res, err := c.cli.Do(req)
-	if err==nil && res.StatusCode >=400{
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+	if res.StatusCode >= 400 {
 		return nil, errors.New(fmt.Sprintf("Http return code - %d: %s", res.StatusCode, res.Status))
 	}
 	return res, err