Problem: insecure RPCs are subject to MITM attacks #86
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Solution: by default, disallow use of non-TLS RPC endpoints
For testing, there's an escape hatch of a command line
argument
--allow-insecure-rpc-endpoints
(purposefullylong) that will reduce the severity of using a non-TLS
RPC endpoint to a warning in a log file.
It was not made to be a configuration file option to reduce
the risk of this option slipping into a production configuration
file by mistake.
Closes #79