add streaming response support

lib/async/http/faraday/adapter.rb

@@ -119,9 +119,23 @@ def call(env)
 						request = ::Protocol::HTTP::Request.new(endpoint.scheme, endpoint.authority, method, endpoint.path, nil, headers, body)
 
 						with_timeout do
-							response = client.call(request)
-
-							save_response(env, response.status, encoded_body(response), response.headers)
+							if env.stream_response?
+								response = env.stream_response do |&on_data|
+									response = client.call(request)
+
+									response.each do |chunk|
+										on_data.call(chunk)
+									end
+
+									response
+								end
+
+								save_response(env, response.status, nil, response.headers)
+							else
+								response = client.call(request)
+
+								save_response(env, response.status, encoded_body(response), response.headers)
+							end
 						end
 					end