Made Passenger more resiliant to Rack bugs. Closes GH-2150.

Rack keeps trying to call eof? on objects that don’t have that method. So implement it for the sake of not having to deal with this anymore.

CHANGELOG

@@ -4,6 +4,8 @@ Release 6.0.2 (Not released yet)
  * Allow compilation to work when Apple messed up their system ruby headers.
  * Only try to read pid 1's /proc files as root, in container detection. Closes GH-2168.
  * Add an option to disable prefixing application logs with "App PID stdout": `PassengerDisableLogPrefix` (Apache) / `passenger_disable_log_prefix` (Nginx). Closes GH-1915
+ * Made Passenger more resiliant to Rack bugs. Closes GH-2150.
+
 
 Release 6.0.1
 -------------

src/ruby_supportlib/phusion_passenger/utils/tee_input.rb

@@ -191,6 +191,12 @@ def each
     self # Rack does not specify what the return value is here
   end
 
+  # Rack repeatedly introduces bugs that rely on this method existing
+  # https://github.com/rack/rack/pull/1201
+  def eof?
+    socket_drained?
+  end
+
 private
 
   def socket_drained?