* [ruby] fix oneOf handling
* use previous ruby configs due to issue #4690
* check for oneOf model in base_object
* validate the attributes in partial_oneof_module
* test file return
* fix stream response
* use options
* use local var
* fix nil tempfile
* fix tempfile
* fix tempfile
* use stream
* check content
* open temp file
* test ruby file download
* fix stream data
* test faraday
* catch connection error
* catch Faraday::ConnectionFailed
* catch all error
* use sream
* refactor
* fi download file in faraday
* local fix
* fi streaming download
* undo changess to spec, test
* undo changes to spec
