Use an early return in senddata.tryInject

internal/senddata/senddata.go

@@ -52,8 +52,12 @@ func (s *sendDataResponseWriter) WriteHeader(status int) {
 }
 
 func (s *sendDataResponseWriter) tryInject() bool {
-	if header := s.Header().Get(HeaderKey); header != "" {
+	header := s.Header().Get(HeaderKey)
 	s.Header().Del(HeaderKey)
+	if header == "" {
+		return false
+	}
+
 	for _, injecter := range s.injecters {
 		if injecter.Match(header) {
 			s.hijacked = true
@@ -61,7 +65,7 @@ func (s *sendDataResponseWriter) tryInject() bool {
 			return true
 		}
 	}
-	}
+
 	return false
 }