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When I'm starting Rails Server to run my app, I get this error on the browser and terminal,
Yesterday It was working fine but suddenly getting this issue,

Puma caught this error: undefined method `then' for #<Array:0x0000558016a1a018> (NoMethodError)
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/rack-proxy-0.7.6/lib/rack/proxy.rb:27:in `extract_http_request_headers'
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/rack-reverse-proxy-0.12.0/lib/rack_reverse_proxy/roundtrip.rb:256:in `headers'
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/rack-reverse-proxy-0.12.0/lib/rack_reverse_proxy/roundtrip.rb:261:in `block in matches'
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/rack-reverse-proxy-0.12.0/lib/rack_reverse_proxy/roundtrip.rb:260:in `select'
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/rack-reverse-proxy-0.12.0/lib/rack_reverse_proxy/roundtrip.rb:260:in `matches'
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/rack-reverse-proxy-0.12.0/lib/rack_reverse_proxy/roundtrip.rb:246:in `find_rule'
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/rack-reverse-proxy-0.12.0/lib/rack_reverse_proxy/roundtrip.rb:242:in `rule'
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/rack-reverse-proxy-0.12.0/lib/rack_reverse_proxy/roundtrip.rb:19:in `call'
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/rack-reverse-proxy-0.12.0/lib/rack_reverse_proxy/middleware.rb:25:in `call'
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/puma-3.12.6/lib/puma/configuration.rb:227:in `call'
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/puma-3.12.6/lib/puma/server.rb:706:in `handle_request'
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/puma-3.12.6/lib/puma/server.rb:476:in `process_client'
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/puma-3.12.6/lib/puma/server.rb:334:in `block in run'
/home/cis/.rvm/gems/ruby-2.5.3@mind_the_speed/gems/puma-3.12.6/lib/puma/thread_pool.rb:135:in `block in spawn_thread'

I searched for this issue but didn't get the solution.

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  • 1
    Ruby 2.5.3 is a bit old and probably not supported by the version of Rails you're using. Commented Dec 1, 2023 at 17:52
  • 1
    While version 7.6 of rack-proxy did not include a required ruby version you can see 7.7 shows >= 2.6.0 Source. This happens to align with your issue since Enumerable#then was introduced in 2.6. Good news here is that 2.5.3 -> 2.6 should not cause any significant issues; however at some point it would be recommended to upgrade to a more modern (i.e. 3.X) ruby version. Commented Dec 1, 2023 at 20:00
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