How do I open a port for render in rust (i am getting timed out)

i am deploying a program written in rust and i keep getting the errors:

==> No open ports detected, continuing to scan…

==> Docs on specifying a port: https://render.com/docs/web-services#port-binding

==> Port scan timeout reached, no open ports detected. Bind your service to at least one port. If you don’t need to receive traffic on any port, create a background worker instead.

==> Docs on specifying a port: https://render.com/docs/web-services#port-binding

**==> Timed Out
**
i have already made a PORT environment variable and set it to 8080. i don’t have anything in my rust scripts that is related to http requests, so how would i add that

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