Allow persistent_timeout to be configured via the dsl.

lib/puma/configuration.rb

@@ -181,7 +181,8 @@ def default_options
         :tag => method(:infer_tag),
         :environment => lambda { ENV['RACK_ENV'] || "development" },
         :rackup => DefaultRackup,
-        :logger => STDOUT
+        :logger => STDOUT,
+        :persistent_timeout => Const::PERSISTENT_TIMEOUT
       }
     end
 

lib/puma/dsl.rb

@@ -133,6 +133,13 @@ def port(port, host=nil)
       bind "tcp://#{host}:#{port}"
     end
 
+    # Define how long persistent connections can be idle before puma closes
+    # them
+    #
+    def persistent_timeout(seconds)
+      @options[:persistent_timeout] = seconds
+    end
+
     # Work around leaky apps that leave garbage in Thread locals
     # across requests
     #

lib/puma/server.rb

@@ -63,7 +63,7 @@ def initialize(app, events=Events.stdio, options={})
       @thread = nil
       @thread_pool = nil
 
-      @persistent_timeout = PERSISTENT_TIMEOUT
+      @persistent_timeout = options[:persistent_timeout]
 
       @binder = Binder.new(events)
       @own_binder = true