How can I develop a proxy server with Deno or nodejs?

[jiawei397]

Sometimes I visit deno land gets stuck, and I can't even download the corresponding resources. I'm not sure whether this is related to the policy.

Because I need to install dependencies in the CICD pipeline, sometimes the installation failure will affect the service update, so I want to use proxy to solve my problem.

Deno supports proxies for module downloads and the Web standard fetch API.
Proxy configuration is read from environmental variables: HTTP_PROXY, HTTPS_PROXY and NO_PROXY.
In case of Windows, if environment variables are not found Deno falls back to reading proxies from registry.

But I don't know how to develop this service? In my imagination, I want to cache the corresponding resources on my server and return directly from the server next time.This step is easy, but I don't know what rules can meet the proxy requirements.