Don't return 500 if mirror url contains special chars (#31859) (#31895)

Backport #31859

Author: lunny

routers/web/repo/setting/setting.go

@@ -248,7 +248,8 @@ func SettingsPost(ctx *context.Context) {
 
 		remoteAddress, err := util.SanitizeURL(form.MirrorAddress)
 		if err != nil {
-			ctx.ServerError("SanitizeURL", err)
+			ctx.Data["Err_MirrorAddress"] = true
+			handleSettingRemoteAddrError(ctx, err, form)
 			return
 		}
 		pullMirror.RemoteAddress = remoteAddress
@@ -409,7 +410,8 @@ func SettingsPost(ctx *context.Context) {
 
 		remoteAddress, err := util.SanitizeURL(form.PushMirrorAddress)
 		if err != nil {
-			ctx.ServerError("SanitizeURL", err)
+			ctx.Data["Err_PushMirrorAddress"] = true
+			handleSettingRemoteAddrError(ctx, err, form)
 			return
 		}