We're running a quite large instance of devpi-sever and faced the issue of not being able to download packages that had recent releases due to the mirror-cache-expiry time. To fix this, we want to set the time to zero, which will result in lots of requests to PyPI.

Following PyPI's recommendations for such scenario, we want to use the User-Agent header to leave some contact information (https://docs.pypi.org/api/#rate-limiting). As far as I can see, this is currently not possible with devpi-sever. Are there any plans to support that?

Note: We don't want to create another service in between our devpi-server instance and PyPI just to inject the User-Agent information.