class Faraday::ProxyOptions

configuration used when making an HTTP request.
ProxyOptions contains the configurable properties for the proxy

def self.from(value) 

def self.from(value)
  case value
  when String
    value = { uri: Utils.URI(value) }
  when URI
    value = { uri: value }
  when Hash, Options
    if (uri = value.delete(:uri))
      value[:uri] = Utils.URI(uri)
    end
  end
  super(value)
end