Issue Description

Type: bug report or feature request

Describe what happened (or what feature you want)

I set server.servlet.content-path=sentinel-dashboard in application.properties, and then open the login page, the sentinel-logo.png icon cannot be displayed because the page request does not carry content-path,because the request to get sentinel-logo.png is http://localhost:5003/assets/img/sentinel-logo.png, without context-path

Describe what you expected to happen

How to reproduce it (as minimally and precisely as possible)

Tell us your environment

windows idea
sentinel version is 1.8.0

Anything else we need to know?