我刚刚设置了一台新Mac（macOS 10.12.3）。我已经安装了RVM，Homebrew等。到目前为止，唯一安装的Ruby是2.4.0，Rails是5.0.1。 rails命令是：
$ rails new food_lookup --api
当运行Rails服务器进行开发工作时，我指定端口3001，但由于某种原因，服务器决定它想要侦听端口3000. Listening on tcp://0.0.0.0:3000
$ rails server --port=3001
/Users/me/.rvm/gems/ruby-2.4.0@food_lookup/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:51: warning: constant ::Fixnum is deprecated
/Users/me/.rvm/gems/ruby-2.4.0@food_lookup/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:52: warning: constant ::Bignum is deprecated
=> Booting Puma
=> Rails 5.0.1 application starting in development on http://localhost:3001
=> Run `rails server -h` for more startup options
/Users/me/.rvm/gems/ruby-2.4.0@food_lookup/gems/activesupport-5.0.1/lib/active_support/core_ext/numeric/conversions.rb:138: warning: constant ::Fixnum is deprecated
Puma starting in single mode...
* Version 3.7.0 (ruby 2.4.0-p0), codename: Snowy Sagebrush
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3000
Use Ctrl-C to stop
此时我的日志是空的。
有没有人见过这个？它在我以前的Mac OS X 10.11上完美运行。我有相同版本的Rails，Ruby等，但也许我忘了在这台新机器上安装一些东西？