How do I pass the response writer and http request to an executable in Go?

I want to run a simple webserver in Go doing some basic authorisation and routing to multiple apps.

Is it possible to have the webserver running as a standalone executable and pass the response writer and http request to other executables?

The idea is that the app binaries can hopefully be compiled and deployed independently of the webserver.

Memory areas of running applications are isolated: a process cannot just read or write another application's memory (Wikipedia: Process isolation).

So just passing the response writer and the http request is not so easy. And even if you would implement it (e.g. serializing them into binary or text data, sending/passing them over somehow, and reconstructing them on the other side) serving an HTTP request in the background is more than just interacting with the ResponseWriter and Request objects: it involves reading from and writing to the underlying TCP connection... so you would also have to "pass" the TCP connection or create a bridge between the real HTTP client and the application you forward to.

Another option would be to send a redirect back to the client (HTTP 3xx status codes) after doing the authentication and routing logic. With this solution you could have authentication and certain routing logic implemented in your app, but you would lose further routing possibilities because further request would go directly to the designated host.

Essentially what you try to create is the functionality of a proxy server which have plenty of implementations out there. Given the complexity of a good proxy server, it should not be feasible to reproduce one.

I suggest to either utilize an existing proxy server or "refactor" your architecture to avoid this kind of segmentation.