Unable to configure context path when using reverse proxy on space

Our company uses reverse proxy for all the services we use. I have installed space on premise(proof of concept) for our testing and to get familiar with the space. Where can i set the context path in configuration files to make it work with reverse proxy. We are planning to use space as project management/development tool for all the teams.

P.S:- I have tried putting context path behind baseurl in the config files(space.on-premises.conf, vcs.on-premises.properties, packages.on-premises.conf ) but could not find desired success. 

Thanks