Remove dead method Handle404 (#25315)

server/channels/app/app.go

@@ -13,7 +13,6 @@ import (
 	"github.com/mattermost/mattermost/server/public/shared/mlog"
 	"github.com/mattermost/mattermost/server/public/shared/timezones"
 	"github.com/mattermost/mattermost/server/v8/channels/product"
-	"github.com/mattermost/mattermost/server/v8/channels/utils"
 	"github.com/mattermost/mattermost/server/v8/einterfaces"
 	"github.com/mattermost/mattermost/server/v8/platform/services/httpservice"
 	"github.com/mattermost/mattermost/server/v8/platform/services/imageproxy"
@@ -46,18 +45,6 @@ func (s *Server) TemplatesContainer() *templates.Container {
 	return s.htmlTemplateWatcher
 }
 
-func (a *App) Handle404(w http.ResponseWriter, r *http.Request) {
-	ipAddress := utils.GetIPAddress(r, a.Config().ServiceSettings.TrustedProxyIPHeader)
-	mlog.Debug("not found handler triggered", mlog.String("path", r.URL.Path), mlog.Int("code", 404), mlog.String("ip", ipAddress))
-
-	if *a.Config().ServiceSettings.WebserverMode == "disabled" {
-		http.NotFound(w, r)
-		return
-	}
-
-	utils.RenderWebAppError(a.Config(), w, r, model.NewAppError("Handle404", "api.context.404.app_error", nil, "", http.StatusNotFound), a.AsymmetricSigningKey())
-}
-
 func (s *Server) getFirstServerRunTimestamp() (int64, *model.AppError) {
 	systemData, err := s.Store().System().GetByName(model.SystemFirstServerRunTimestampKey)
 	if err != nil {