refactor: improve response body handling in token retrieval

client/token.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"gitea.siteworxpro.com/golang-packages/email-api-client/redis"
+	"io"
 	"net/http"
 	"time"
 )
@@ -52,8 +53,11 @@ func getToken(configuration *Configuration) (*Token, error) {
 		return nil, errors.New("Failed to retrieve access token: " + resp.Status)
 	}
 
-	responseBody := make([]byte, resp.ContentLength)
-	_, err = resp.Body.Read(responseBody)
+	defer func(Body io.ReadCloser) {
+		_ = Body.Close()
+	}(resp.Body)
+
+	responseBody, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return nil, err
 	}