A reverse proxy server can serve as an intermediary between your server and any other third party (for us, it's a GitHub enterprise server). When your server needs to make a request, it prompts the proxy server to initiate the request to the third party, and vice versa.

Setting up a reverse proxy server for fixed IP address on Digital Ocean

All in all, took us 2 days to migrate from Heroku to Digital Ocean, and we went from spending 560$ to 67$ per month for a similar type of server. We made some trade-offs:

Digital-ocean

Setting up a reverse proxy server for fixed IP address on Digital Ocean

My experience migrating our backend from Heroku to Digital Ocean