Add response status code check (#25)

* Add response status code check

* Update client.go

* Use fmt.Errorf

Author: vikmeup

client/client.go

@@ -9,6 +9,7 @@ import (
 	"io/ioutil"
 	"net/http"
 	"net/url"
+	"strconv"
 	"strings"
 	"time"
 )
@@ -115,6 +116,11 @@ func (r *Request) Execute(method string, url string, body io.Reader, result inte
 	if err != nil {
 		return err
 	}
+
+	if res.StatusCode < http.StatusOK && res.StatusCode >= http.StatusBadRequest {
+		return fmt.Errorf("failed request status: %s for url: %s", strconv.Itoa(res.StatusCode), res.Request.RequestURI)
+	}
+
 	defer res.Body.Close()
 	b, err := ioutil.ReadAll(res.Body)
 	if err != nil {