faraday-1.4.2/lib/faraday/connection.rb:423: warning: instance variable @manual_proxy not initialized

[gurgeous]

Basic Info

• Faraday Version: 1.4.2
• Ruby Version: 2.7.2

Issue description

My console is filling up with a new warning when I run tests:

faraday-1.4.2/lib/faraday/connection.rb:423: warning: instance variable @manual_proxy not initialized
faraday-1.4.2/lib/faraday/connection.rb:423: warning: instance variable @manual_proxy not initialized
faraday-1.4.2/lib/faraday/connection.rb:423: warning: instance variable @manual_proxy not initialized
...

This warning will be shown to anyone running with Ruby warnings enabled, which is the default for Rake::TestTask.

It's caused by @manual_proxy being accessed in url_prefix= before calling initialize_proxy in the constructor. A simple fix would be to set @manual_proxy = nil up top in the constructor.

Steps to reproduce

$ irb -w
>> require 'faraday' ; Faraday.default_connection
faraday-1.4.2/lib/faraday/connection.rb:423: warning: instance variable @manual_proxy not initialized