lostisland/faraday

@embs sorry I missed your message! I’m trying to reproduce that issue on my Mac but I see a normal Faraday::ConnectionFailed exception being raised. Could you provide some additional information about your OS and if there’s something listening to that port?

@iMacTia no problem. Thanks for your help! I was able to investigate this further and could reliably reproduce it when running on Docker.

The problem seems to have been fixed in v1.

If we build two docker images, say faraday-get-localhost:0.17.3 with a Dockerfile such as

FROM ruby:2.5.3-slim

RUN gem install faraday -v 0.17.3

CMD ruby -e "require 'faraday'; p Faraday::VERSION; Faraday.get('http://localhost:9875')"

and another image for v1:

FROM ruby:2.5.3-slim

RUN gem install faraday

CMD ruby -e "require 'faraday'; p Faraday::VERSION; Faraday.get('http://localhost:9875')"

Then when we run 0.17.3 we get an EADDRNOTAVAIL:

$ docker run faraday-get-localhost:0.17.3
"0.17.3"
/usr/local/lib/ruby/2.5.0/net/http.rb:939:in `rescue in block in connect': Failed to open TCP connection to localhost:9875 (Cannot assign requested address - connect(2) for "localhost" port 9875) (Errno::EADDRNOTAVAIL)
        from /usr/local/lib/ruby/2.5.0/net/http.rb:936:in `block in connect'
        from /usr/local/lib/ruby/2.5.0/timeout.rb:93:in `block in timeout'
        from /usr/local/lib/ruby/2.5.0/timeout.rb:103:in `timeout'
        from /usr/local/lib/ruby/2.5.0/net/http.rb:935:in `connect'
        from /usr/local/lib/ruby/2.5.0/net/http.rb:920:in `do_start'
        from /usr/local/lib/ruby/2.5.0/net/http.rb:909:in `start'
        from /usr/local/lib/ruby/2.5.0/net/http.rb:1455:in `request'
        from /usr/local/lib/ruby/2.5.0/net/http.rb:1213:in `get'
        from /usr/local/bundle/gems/faraday-0.17.3/lib/faraday/adapter/net_http.rb:85:in `perform_request'                                                                                    
        from /usr/local/bundle/gems/faraday-0.17.3/lib/faraday/adapter/net_http.rb:43:in `block in call'                                                                                      
        from /usr/local/bundle/gems/faraday-0.17.3/lib/faraday/adapter/net_http.rb:92:in `with_net_http_connection'                                                                           
        from /usr/local/bundle/gems/faraday-0.17.3/lib/faraday/adapter/net_http.rb:38:in `call'
        from /usr/local/bundle/gems/faraday-0.17.3/lib/faraday/request/url_encoded.rb:15:in `call'                                                                                            
        from /usr/local/bundle/gems/faraday-0.17.3/lib/faraday/rack_builder.rb:143:in `build_response'                                                                                        
        from /usr/local/bundle/gems/faraday-0.17.3/lib/faraday/connection.rb:387:in `run_request'                                                                                             
        from /usr/local/bundle/gems/faraday-0.17.3/lib/faraday/connection.rb:138:in `get'
        from /usr/local/bundle/gems/faraday-0.17.3/lib/faraday.rb:102:in `method_missing'
        from -e:1:in `<main>'

But when running v1 we get a proper Faraday::ConnectionFailed:

$ docker run faraday-get-localhost:1.0
"1.0.0"
/usr/local/lib/ruby/2.5.0/net/http.rb:939:in `rescue in block in connect': Failed to open TCP connection to localhost:9875 (Cannot assign requested address - connect(2) for "localhost" port 9875) (Faraday::ConnectionFailed)
        from /usr/local/lib/ruby/2.5.0/net/http.rb:936:in `block in connect'
        from /usr/local/lib/ruby/2.5.0/timeout.rb:93:in `block in timeout'
        from /usr/local/lib/ruby/2.5.0/timeout.rb:103:in `timeout'
        from /usr/local/lib/ruby/2.5.0/net/http.rb:935:in `connect'
        from /usr/local/lib/ruby/2.5.0/net/http.rb:920:in `do_start'
        from /usr/local/lib/ruby/2.5.0/net/http.rb:909:in `start'
        from /usr/local/lib/ruby/2.5.0/net/http.rb:1455:in `request'
        from /usr/local/lib/ruby/2.5.0/net/http.rb:1