config baseUrl with https://example.io/ but got https://example.io:1313/ for static file

What version of Hugo are you using ( hugo version )?

$ hugo version v0.88.1-5BC54738

Does this issue reproduce with the latest release?

i’m a new user for hugo , when i use command like this:

hugo server --theme=hyde --buildDrafts --source=/opt/blog --config config.toml --baseUrl=https://example.io/

and set a nginx proxy with port 80 between hugo and browser.
i got css file path eg: https://example.io:1313/a.css in browser html content, but i want get https://example.io/, any config can do this?

--appendPort=false