spring cloud gateway代理静态文件，304

配置

      - id: file_route
        uri: http://172.18.248.xx
        predicates:
        - Path=/sysFile/**
        filters:
        - FilePathFilterFactory
        - RewritePath=/sysFile(?<segment>/?.*), $\{segment}
        - AddResponseHeader=X-Response-Time, 100ms
        - AddResponseHeader=Cache-Control, public,max-age=31536000,immutable