1 files changed, 74 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/metal/exceptions.rb b/actionpack/lib/action_controller/metal/exceptions.rb
new file mode 100644
index 0000000000..30034be018
--- /dev/null
+++ b/actionpack/lib/action_controller/metal/exceptions.rb
@@ -0,0 +1,74 @@
+# frozen_string_literal: true
+
+module ActionController
+  class ActionControllerError < StandardError #:nodoc:
+  end
+
+  class BadRequest < ActionControllerError #:nodoc:
+    def initialize(msg = nil)
+      super(msg)
+      set_backtrace $!.backtrace if $!
+    end
+  end
+
+  class RenderError < ActionControllerError #:nodoc:
+  end
+
+  class RoutingError < ActionControllerError #:nodoc:
+    attr_reader :failures
+    def initialize(message, failures = [])
+      super(message)
+      @failures = failures
+    end
+  end
+
+  class UrlGenerationError < ActionControllerError #:nodoc:
+  end
+
+  class MethodNotAllowed < ActionControllerError #:nodoc:
+    def initialize(*allowed_methods)
+      super("Only #{allowed_methods.to_sentence(locale: :en)} requests are allowed.")
+    end
+  end
+
+  class NotImplemented < MethodNotAllowed #:nodoc:
+  end
+
+  class MissingFile < ActionControllerError #:nodoc:
+  end
+
+  class SessionOverflowError < ActionControllerError #:nodoc:
+    DEFAULT_MESSAGE = "Your session data is larger than the data column in which it is to be stored. You must increase the size of your data column if you intend to store large data."
+
+    def initialize(message = nil)
+      super(message || DEFAULT_MESSAGE)
+    end
+  end
+
+  class UnknownHttpMethod < ActionControllerError #:nodoc:
+  end
+
+  class UnknownFormat < ActionControllerError #:nodoc:
+  end
+
+  # Raised when a nested respond_to is triggered and the content types of each
+  # are incompatible. For exampe:
+  #
+  #  respond_to do |outer_type|
+  #    outer_type.js do
+  #      respond_to do |inner_type|
+  #        inner_type.html { render body: "HTML" }
+  #      end
+  #    end
+  #  end
+  class RespondToMismatchError < ActionControllerError
+    DEFAULT_MESSAGE = "respond_to was called multiple times and matched with conflicting formats in this action. Please note that you may only call respond_to and match on a single format per action."
+
+    def initialize(message = nil)
+      super(message || DEFAULT_MESSAGE)
+    end
+  end
+
+  class MissingExactTemplate < UnknownFormat #:nodoc:
+  end
+end