Fix potencial issue in gzip with cfg initialization

Add test for bug 275

1 files changed, 4 insertions, 5 deletions

diff --git a/service/gzip/service.go b/service/gzip/service.go
index 5ae3ffd5..231ba4d9 100644
--- a/service/gzip/service.go
+++ b/service/gzip/service.go
@@ -9,21 +9,20 @@ import (
 
 // ID contains default service name.
 const ID = "gzip"
-var httpNotInitialized = errors.New("http service should be defined properly in config")
+var httpNotInitialized = errors.New("http service should be defined properly in config to use gzip")
 
 type Service struct {
 	cfg *Config
 }
 
 func (s *Service) Init(cfg *Config, r *rrhttp.Service) (bool, error) {
-	if r == nil {
-		return false, httpNotInitialized
-	}
 	s.cfg = cfg
-
 	if !s.cfg.Enable {
 		return false, nil
 	}
+	if r == nil {
+		return false, httpNotInitialized
+	}
 
 	r.AddMiddleware(s.middleware)