http_request: support rack.hijack by default

Rack 1.4 and earlier will soon die out, so avoid having extra code

The only minor overhead is assigning two hash slots and
the extra hash checks when running ancient versions of Rack,
so it is unlikely anybody cares about that overhead with Rack 1.5
and later.

1 files changed, 9 insertions, 23 deletions

diff --git a/lib/unicorn/http_request.rb b/lib/unicorn/http_request.rb
index 9888430..b32003e 100644
--- a/lib/unicorn/http_request.rb
+++ b/lib/unicorn/http_request.rb
@@ -13,13 +13,16 @@ class Unicorn::HttpParser
     "rack.multiprocess" => true,
     "rack.multithread" => false,
     "rack.run_once" => false,
-    "rack.version" => [1, 1],
+    "rack.version" => [1, 2],
+    "rack.hijack?" => true,
     "SCRIPT_NAME" => "",
 
     # this is not in the Rack spec, but some apps may rely on it
     "SERVER_SOFTWARE" => "Unicorn #{Unicorn::Const::UNICORN_VERSION}"
   }
 
+  RACK_HIJACK = "rack.hijack".freeze
+  RACK_HIJACK_IO = "rack.hijack_io".freeze
   NULL_IO = StringIO.new("")
 
   attr_accessor :response_start_sent
@@ -98,28 +101,11 @@ class Unicorn::HttpParser
     e.merge!(DEFAULTS)
   end
 
-  # Rack 1.5.0 (protocol version 1.2) adds hijack request support
-  if ((Rack::VERSION[0] << 8) | Rack::VERSION[1]) >= 0x0102
-    DEFAULTS["rack.hijack?"] = true
-    DEFAULTS["rack.version"] = [1, 2]
-
-    RACK_HIJACK = "rack.hijack".freeze
-    RACK_HIJACK_IO = "rack.hijack_io".freeze
-
-    def hijacked?
-      env.include?(RACK_HIJACK_IO)
-    end
-
-    def hijack_setup(e, socket)
-      e[RACK_HIJACK] = proc { e[RACK_HIJACK_IO] = socket }
-    end
-  else
-    # old Rack, do nothing.
-    def hijack_setup(e, _)
-    end
+  def hijacked?
+    env.include?(RACK_HIJACK_IO)
+  end
 
-    def hijacked?
-      false
-    end
+  def hijack_setup(e, socket)
+    e[RACK_HIJACK] = proc { e[RACK_HIJACK_IO] = socket }
   end
 end