proxy-agent not working on Deno Deploy

I'm trying to use a proxy for the node-fetch requests in a deno app.

I chose proxy-agent npm package and its working great on my local. It reads HTTP_PROXY environment variable and uses that host as the proxy.

But when I deploy my app in Deno Deploy, proxy is not working. I set the environment variable correctly but proxy-agent is just ignoring that?

I appreciate any help.