From 927ff4493f2969ac8aa5980fa9cdaa6450220a2b Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@oriontransfer.co.nz>
Date: Fri, 13 Nov 2020 22:15:57 +1300
Subject: Add support for default app (404).

---
 lib/rack/builder.rb | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'lib')

diff --git a/lib/rack/builder.rb b/lib/rack/builder.rb
index 6f2ab0aa..fa64ae3e 100644
--- a/lib/rack/builder.rb
+++ b/lib/rack/builder.rb
@@ -109,10 +109,12 @@ module Rack
       return builder.to_app
     end
 
+    DEFAULT_APP = proc{|env| [404, [], []]}
+
     # Initialize a new Rack::Builder instance.  +default_app+ specifies the
     # default application if +run+ is not called later.  If a block
     # is given, it is evaluted in the context of the instance.
-    def initialize(default_app = nil, **options, &block)
+    def initialize(default_app = DEFAULT_APP, **options, &block)
       @use = []
       @map = nil
       @run = default_app
@@ -247,8 +249,8 @@ module Rack
     # Return the Rack application generated by this instance.
     def to_app
       app = @map ? generate_map(@run, @map) : @run
-      fail "missing run or map statement" unless app
       app.freeze if @freeze_app
+
       app = @use.reverse.inject(app) { |a, e| e[a].tap { |x| x.freeze if @freeze_app } }
       @warmup.call(app) if @warmup
       app
-- 
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