Try nginx

.buildpacks

@@ -1,2 +1,3 @@
 https://github.com/heroku/heroku-buildpack-ruby.git
 https://github.com/drogus/last-commit-sha-buildpack.git
+https://github.com/ryandotsmith/nginx-buildpack.git

Procfile

@@ -1,2 +1,2 @@
-web: bundle exec ./script/server
+web: bin/start-nginx bundle exec ./script/server
 console: bundle exec ./script/console

config/puma-config.rb

@@ -0,0 +1,9 @@
+root = File.expand_path('../..', __FILE__)
+
+rackup "#{root}/config.ru"
+
+bind 'unix:///tmp/nginx.socket'
+
+environment ENV['RACK_ENV'] || 'development'
+
+threads 0, 16

lib/travis/api/app.rb

@@ -12,6 +12,7 @@ require 'raven'
 require 'sidekiq'
 require 'metriks/reporter/logger'
 require 'travis/support/log_subscriber/active_record_metrics'
+require 'fileutils'
 
 # Rack class implementing the HTTP API.
 # Instances respond to #call.
@@ -45,6 +46,7 @@ module Travis::Api
     def self.setup(options = {})
       setup! unless setup?
       Endpoint.set(options) if options
+      FileUtils.touch('/tmp/app-initialized')
     end
 
     def self.new(options = {})

script/server

@@ -3,6 +3,6 @@ cd "$(dirname "$0")/.."
 [ $PORT ]     || PORT=3000
 [ $RACK_ENV ] || RACK_ENV=development
 
-cmd="ruby -I lib -S bundle exec ruby -I lib -S puma config.ru -p $PORT -e $RACK_ENV --threads 0:16"
+cmd="ruby -I lib -S bundle exec ruby -I lib -S puma -C config/puma-config.rb"
 [[ $RACK_ENV == "development" ]] && exec rerun "$cmd -b tcp://127.0.0.1:$PORT"
 exec $cmd