Support for custom port

[luochen1990]

Is your feature request related to a problem? Please describe.

When I'm using a custom port which is neither 80 nor 443, the jump link (such as login and search page) will lose the port, and this cannot be solved by an Nginx configuration since these port might not be accessable for some special reason.

Describe the solution you'd like

Add an option such as "jump_url_prefix" so that user can specify the correct url prefix.

Describe alternatives you've considered

Add an option such as "public_port" so that user can specify the correct port.