provide a option like "--baseurl" to set up the static file request behind a reverse proxy like nginx.

I also meet with this problem,cause the influxdb oss did not provide a option like "--baseurl" to set up the static file request behind a reverse proxy like nginx. The option it provided is "--http-bind-address" which can only set up the host&port [check the doc](https://v2.docs.influxdata.com/v2.0/reference/urls/).

Start with the HTTP configuration described by --http-bind-address and the linked URL documentation, then trace how static-file requests are formed when InfluxDB runs behind nginx. Done means a documented base URL option allows those requests to resolve correctly through a reverse proxy, with appropriate tests for the behavior.

Written by the indexing model from the issue text.