[close #1327] Fix double port bind in Rails #1383
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The "default" configuration puma level is initialized with a "binds" of `tcp://0.0.0.0:9292`. Puma is designed to be able to bind to multiple ports. When a `:port` is sent from Rails along with an empty `user_supplied_options` then the port is treated as a "default". This is merged in with the system defaults, and then later converted into a "binds" via calling `config.port` in the `set_host_port_to_config` method. The bug comes due to the "level" of the configuration. Since both are being set on the same "level" the `port` call does not over-write the existing binds but instead prepends to the array. We can fix by ensuring that any binds in a given "level" are empty before setting it.
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The "default" configuration puma level is initialized with a "binds" of
tcp://0.0.0.0:9292. Puma is designed to be able to bind to multiple ports.When a
:portis sent from Rails along with an emptyuser_supplied_optionsthen the port is treated as a "default". This is merged in with the system defaults, and then later converted into a "binds" via callingconfig.portin theset_host_port_to_configmethod.The bug comes due to the "level" of the configuration. Since both are being set on the same "level" the
portcall does not over-write the existing binds but instead prepends to the array. We can fix by ensuring that any binds in a given "level" are empty before setting it.