- support add header for location
- support x-forwarded-for
- error page
- http peer option
- access log
- support format for env logger(or tokio tracing)
- better error handler
- config validate
- support add tls
- log rotate
- stats of server
- start without config
- static serve for admin
- status:499 for client abort
- support get pingap start time
- custom error for pingora error
- authentication for admin page
- static file serve
- set priority for location
- mock response for upstream
- add remark for config
- support multi host for location?
- support set upstream_keepalive_pool_size
- graceful restart for admin web
- use stable pingora