Looks like John Speare was able to answer your question:
"Hey Ravi -- the scenario you describe is the default reverse proxy scenario, where you set up the reverse proxy in pass-through/passive mode. You don't need to implement the 302 response. If you are running the 10.3 (or higher) version of Tableau Server, then the new x-Tableau header should work with all standard proxy solutions. Take a look at this: Configuring Proxies for Tableau Server"
Hope this helps!