From 59a02fb7bcbe68f26e1e7fdcec45c00c66e4a065 Mon Sep 17 00:00:00 2001 From: eileencodes Date: Tue, 26 Sep 2017 13:27:53 -0400 Subject: Implement H2 Early Hints for Rails When puma/puma#1403 is merged Puma will support the Early Hints status code for sending assets before a request has finished. While the Early Hints spec is still in draft, this PR prepares Rails to allowing this status code. If the proxy server supports Early Hints, it will send H2 pushes to the client. This PR adds a method for setting Early Hints Link headers via Rails, and also automatically sends Early Hints if supported from the `stylesheet_link_tag` and the `javascript_include_tag`. Once puma supports Early Hints the `--early-hints` argument can be passed to the server to enable this or set in the puma config with `early_hints(true)`. Note that for Early Hints to work in the browser the requirements are 1) a proxy that can handle H2, and 2) HTTPS. To start the server with Early Hints enabled pass `--early-hints` to `rails s`. This has been verified to work with h2o, Puma, and Rails with Chrome. The commit adds a new option to the rails server to enable early hints for Puma. Early Hints spec: https://tools.ietf.org/html/draft-ietf-httpbis-early-hints-04 [Eileen M. Uchitelle, Aaron Patterson] --- railties/test/commands/server_test.rb | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'railties/test') diff --git a/railties/test/commands/server_test.rb b/railties/test/commands/server_test.rb index 556c2289e7..a6201e4f04 100644 --- a/railties/test/commands/server_test.rb +++ b/railties/test/commands/server_test.rb @@ -81,6 +81,18 @@ class Rails::ServerTest < ActiveSupport::TestCase assert_equal false, options[:caching] end + def test_early_hints_with_option + args = ["--early-hints"] + options = parse_arguments(args) + assert_equal true, options[:early_hints] + end + + def test_early_hints_is_nil_by_default + args = [] + options = parse_arguments(args) + assert_nil options[:early_hints] + end + def test_log_stdout with_rack_env nil do with_rails_env nil do -- cgit v1.2.3