Add clearer exception on misconfigured REMOTE_ADDR #220
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Certain configurations of Django when running behind a reverse proxy that communicates with the app server over Unix sockets can lead to REMOTE_ADDR being empty or missing. In these situations, IP-based ratelimiting can behave unexpectedly or fail in unclear ways. This makes the exception for an empty REMOTE_ADDR more clear and points to the documentation.
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Fixes #209.