Why is my outbound connection being refused?

I deployed the following app as a Google Cloud Run service:

package main import ( "io" "net/http" ) func main() { http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { resp, err := http.Get("https://dummyjson.com/products") if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } io.Copy(w, resp.Body) }) http.ListenAndServe(":8080", nil) }

I deployed the app as code (no Dockerfile):

gcloud run deploy app --quiet --source . --region us-east1

When I navigate to the service, I see the following error:

Get "https://dummyjson.com/products": dial tcp: lookup dummyjson.com on [::1]:53: read udp [::1]:21264->[::1]:53: read: connection refused

This is the only service in my Google Cloud project. VPC Network is set to None. It's my understanding that Cloud Run services that are not part of a VPC should be able to make egress connections out of the box and without any special configuration.

Why is my outbound request being refused?