class Faraday::RackBuilder

:ssl - Hash of options for configuring SSL requests.
:password - Proxy server password
:user - Proxy server username
:uri - Proxy Server URI
:proxy - Hash of proxy options
:open_timeout - read timeout Integer in seconds
:timeout - open/read timeout Integer in seconds
:request - Hash of options for configuring the request.
:parallel_manager - sent if the connection is in parallel mode
:response_headers - Hash of HTTP headers from the server
:request_headers - hash of HTTP Headers to be sent to the server
:status - HTTP response status code
:url - URI instance for the current request.
:body - the request body that will eventually be converted to a string.
:http_method - a symbolized request HTTP method (:get, :post)
ENV Keys

def build_env(connection, request)
  exclusive_url = connection.build_exclusive_url(
    request.path, request.params,
    request.options.params_encoder
  )
  Env.new(request.http_method, request.body, exclusive_url,
          request.options, request.headers, connection.ssl,
          connection.parallel_manager)
end