Uplink connection timeout returns incorrect status code

[ianschmitz]

This issue may be related to #720.

Describe the bug
We discovered this issue while porting create-react-app over to Azure DevOps build pipeline (facebook/create-react-app#7096). If a connection to the uplink (e.g. registry.npmjs.org) times out, Verdaccio returns a 404 status code, which causes the npm/yarn client to fail.

Expected behavior
Verdaccio should return a 503 status code which tells the npm/yarn client to try again.

@willsmythe helped us fix this in a fork of his. You can see the diff here: master...willsmythe:fix-404-on-uplink-timeout.

[juanpicado]

Thanks @ianschmitz the commit provided have really interesting things, I'll check it myself.

[willsmythe]

I just pushed a few updates to my branch and will open a PR so we can discuss the changes.

[lock]

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