web ui config alert silence output 404

[like-inspur]

What did you do?
choose one alert in alertmanager ui and config silence

What did you expect to see?
silence create successfully

What did you see instead? Under which circumstances?
404 Not found

Environment: docker

• Alertmanager version: 0.18.0

• Alertmanager configuration file: default config

• Logs:

level=debug ts=2020-12-07T09:33:56.828Z caller=silence.go:817 component=silences msg="Gossiping new silence" silence="silence:<id:\"7575b5f6-5611-4a1e-8f52-071a1c1ecccc\" matchers:<name:\"alertname\" pattern:\"HeartBeats\" > matchers:<name:\"service\" pattern:\"opscenter\" > matchers:<name:\"severity\" pattern:\"warning\" > starts_at:<seconds:1607328953 nanos:366214313 > ends_at:<seconds:1607333636 nanos:322952558 > updated_at:<seconds:1607333636 nanos:322952558 > created_by:\"test\" comment:\"test\" > expires_at:<seconds:1607765636 nanos:322952558 > "

[simonpasquier]

I'd check the client request and server response using the network monitor (or equivalent tool depending of your browser of choice).