How to read an HTTP chunked response and send chunked response to client in Elixir?

I'm using Elixir/Phoenix and I have an endpoint that returns a chunked response like say a never ending stream of log lines. The log lines, however, come from another service A which also returns a chunked response. I want my endpoint to read the chunked response from service A and pass them through to the client also in chunks. In essence, it's just a proxy for service A, but I can't let the client connect directly to service A because I need to perform some authentication.