fix: set content-type for json errors

Author: christophwitzko

internal/server/helper.go

@@ -8,8 +8,12 @@ import (
 	"github.com/go-chi/chi/v5/middleware"
 )
 
-func (s *Server) writeJSON(w http.ResponseWriter, d any) {
+func (s *Server) setContentTypeJSON(w http.ResponseWriter) {
 	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+}
+
+func (s *Server) writeJSON(w http.ResponseWriter, d any) {
+	s.setContentTypeJSON(w)
 	err := json.NewEncoder(w).Encode(d)
 	if err != nil {
 		s.log.Error(err)
@@ -19,7 +23,10 @@ func (s *Server) writeJSON(w http.ResponseWriter, d any) {
 func (s *Server) writeJSONError(w http.ResponseWriter, r *http.Request, statusCode int, err error, alternativeMessage ...string) {
 	errMsg := err.Error()
 	s.log.Errorf("[%s] error(status=%d): %s", middleware.GetReqID(r.Context()), statusCode, errMsg)
+
+	s.setContentTypeJSON(w)
 	w.WriteHeader(statusCode)
+
 	if len(alternativeMessage) > 0 {
 		errMsg = strings.Join(alternativeMessage, " ")
 	}