CHW-4305 UpstreamPackageExists
package name already exists in the upstream registry; only names unused upstream can be registered as internal packages
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Default message: package name already exists in the upstream registry; only names unused upstream can be registered as internal packages
HTTP status:409(client)
Problem. The package name is already claimed on the proxy’s upstream registry. Cause. Registering this name internally would shadow a real upstream package, which would flip the typosquat guardrail on its head — clients expecting the upstream version would silently get the internal copy. Fix. Pick a scoped / prefixed package name not claimed upstream, or ask an operator to point the proxy at a private registry. HTTP 409.