Set Verdaccio's HTTPS Uplink Proxy in config.yaml

Add https_proxy to the uplink that fetches from the HTTPS npm registry, using the actual intermediary URL.

uplinks:
  npmjs:
    url: https://registry.npmjs.org/
    https_proxy: http://proxy.example.net:8080

Merge this into the existing uplink configuration. https_proxy is selected because the registry URL is HTTPS; http://proxy.example.net:8080 describes the HTTP proxy listener carrying that connection. When the public npm uplink may use a public HTTP endpoint, select a candidate from the HTTP proxy list for this value.

An uplink-level value takes priority over Verdaccio's documented global http_proxy and https_proxy settings. Use that scope when different upstream registries need different routes, retaining the existing uplink authentication and package-access rules.

This is the server's package-fetching path. If a developer cannot reach Verdaccio at all, inspect the npm client's route to Verdaccio instead. A reverse proxy accepting incoming requests likewise does not set this outbound uplink value.

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