[BUG][Ruby] Faraday - handle HTTP 0 without Typhoeus/libcurl

Created by: jethrodaniel

Description

When using the Ruby faraday library The Ruby client, when built with the faraday library option, currently handles HTTP 0 response in a curl/typhoeus specific way, which errors if you're using a different adapter (which is the default case).

The actual error is a no method error for return_message on Faraday::Response.

openapi-generator version

openapitools/openapi-generator-cli:v6.2.0

Generation Details

Relevant portion of openapi-generator-config.yaml :

library: faraday
gemRequiredRubyVersion: '>= 2.7'

Suggest a fix

Fix is simple, just add a respond_to? here in the response.status == 0 conditional: https://github.com/OpenAPITools/openapi-generator/blob/3eec4eb326a6c7abd49dcd60e63f3019b966466f/modules/openapi-generator/src/main/resources/ruby-client/api_client_faraday_partial.mustache#L15-L26

i.e,

           unless response.success?
-            if response.status == 0
+            if response.status == 0 && response.respond_to?(:return_message)
               # Errors from libcurl will be made visible here
               fail ApiError.new(code: 0,
                                 message: response.return_message)